diff --git a/app/src/main/java/eu/kanade/domain/category/interactor/CreateCategoryWithName.kt b/app/src/main/java/eu/kanade/domain/category/interactor/CreateCategoryWithName.kt
index be3a4adcd..7daafb71b 100644
--- a/app/src/main/java/eu/kanade/domain/category/interactor/CreateCategoryWithName.kt
+++ b/app/src/main/java/eu/kanade/domain/category/interactor/CreateCategoryWithName.kt
@@ -1,7 +1,6 @@
 package eu.kanade.domain.category.interactor
 
 import eu.kanade.domain.category.model.Category
-import eu.kanade.domain.category.model.anyWithName
 import eu.kanade.domain.category.repository.CategoryRepository
 import eu.kanade.domain.library.service.LibraryPreferences
 import eu.kanade.tachiyomi.util.lang.withNonCancellableContext
@@ -23,10 +22,6 @@ class CreateCategoryWithName(
 
     suspend fun await(name: String): Result = withNonCancellableContext {
         val categories = categoryRepository.getAll()
-        if (categories.anyWithName(name)) {
-            return@withNonCancellableContext Result.NameAlreadyExistsError
-        }
-
         val nextOrder = categories.maxOfOrNull { it.order }?.plus(1) ?: 0
         val newCategory = Category(
             id = 0,
@@ -46,7 +41,6 @@ class CreateCategoryWithName(
 
     sealed class Result {
         object Success : Result()
-        object NameAlreadyExistsError : Result()
         data class InternalError(val error: Throwable) : Result()
     }
 }
diff --git a/app/src/main/java/eu/kanade/domain/category/interactor/RenameCategory.kt b/app/src/main/java/eu/kanade/domain/category/interactor/RenameCategory.kt
index ef531599b..b298ac020 100644
--- a/app/src/main/java/eu/kanade/domain/category/interactor/RenameCategory.kt
+++ b/app/src/main/java/eu/kanade/domain/category/interactor/RenameCategory.kt
@@ -2,7 +2,6 @@ package eu.kanade.domain.category.interactor
 
 import eu.kanade.domain.category.model.Category
 import eu.kanade.domain.category.model.CategoryUpdate
-import eu.kanade.domain.category.model.anyWithName
 import eu.kanade.domain.category.repository.CategoryRepository
 import eu.kanade.tachiyomi.util.lang.withNonCancellableContext
 import eu.kanade.tachiyomi.util.system.logcat
@@ -13,11 +12,6 @@ class RenameCategory(
 ) {
 
     suspend fun await(categoryId: Long, name: String) = withNonCancellableContext {
-        val categories = categoryRepository.getAll()
-        if (categories.anyWithName(name)) {
-            return@withNonCancellableContext Result.NameAlreadyExistsError
-        }
-
         val update = CategoryUpdate(
             id = categoryId,
             name = name,
@@ -36,7 +30,6 @@ class RenameCategory(
 
     sealed class Result {
         object Success : Result()
-        object NameAlreadyExistsError : Result()
         data class InternalError(val error: Throwable) : Result()
     }
 }
diff --git a/app/src/main/java/eu/kanade/presentation/category/components/CategoryDialogs.kt b/app/src/main/java/eu/kanade/presentation/category/components/CategoryDialogs.kt
index ca3efb421..bd0596289 100644
--- a/app/src/main/java/eu/kanade/presentation/category/components/CategoryDialogs.kt
+++ b/app/src/main/java/eu/kanade/presentation/category/components/CategoryDialogs.kt
@@ -15,6 +15,7 @@ import androidx.compose.ui.focus.FocusRequester
 import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.res.stringResource
 import eu.kanade.domain.category.model.Category
+import eu.kanade.domain.category.model.anyWithName
 import eu.kanade.tachiyomi.R
 import kotlinx.coroutines.delay
 import kotlin.time.Duration.Companion.seconds
@@ -23,17 +24,23 @@ import kotlin.time.Duration.Companion.seconds
 fun CategoryCreateDialog(
     onDismissRequest: () -> Unit,
     onCreate: (String) -> Unit,
+    categories: List<Category>,
 ) {
     var name by remember { mutableStateOf("") }
+
     val focusRequester = remember { FocusRequester() }
+    val nameAlreadyExists = remember(name) { categories.anyWithName(name) }
 
     AlertDialog(
         onDismissRequest = onDismissRequest,
         confirmButton = {
-            TextButton(onClick = {
-                onCreate(name)
-                onDismissRequest()
-            },) {
+            TextButton(
+                enabled = name.isNotEmpty() && !nameAlreadyExists,
+                onClick = {
+                    onCreate(name)
+                    onDismissRequest()
+                },
+            ) {
                 Text(text = stringResource(R.string.action_add))
             }
         },
@@ -47,13 +54,15 @@ fun CategoryCreateDialog(
         },
         text = {
             OutlinedTextField(
-                modifier = Modifier
-                    .focusRequester(focusRequester),
+                modifier = Modifier.focusRequester(focusRequester),
                 value = name,
                 onValueChange = { name = it },
-                label = {
-                    Text(text = stringResource(R.string.name))
+                label = { Text(text = stringResource(R.string.name)) },
+                supportingText = {
+                    val msgRes = if (name.isNotEmpty() && nameAlreadyExists) R.string.error_category_exists else R.string.information_required_plain
+                    Text(text = stringResource(msgRes))
                 },
+                isError = name.isNotEmpty() && nameAlreadyExists,
                 singleLine = true,
             )
         },
@@ -70,18 +79,25 @@ fun CategoryCreateDialog(
 fun CategoryRenameDialog(
     onDismissRequest: () -> Unit,
     onRename: (String) -> Unit,
+    categories: List<Category>,
     category: Category,
 ) {
     var name by remember { mutableStateOf(category.name) }
+    var valueHasChanged by remember { mutableStateOf(false) }
+
     val focusRequester = remember { FocusRequester() }
+    val nameAlreadyExists = remember(name) { categories.anyWithName(name) }
 
     AlertDialog(
         onDismissRequest = onDismissRequest,
         confirmButton = {
-            TextButton(onClick = {
-                onRename(name)
-                onDismissRequest()
-            },) {
+            TextButton(
+                enabled = valueHasChanged && !nameAlreadyExists,
+                onClick = {
+                    onRename(name)
+                    onDismissRequest()
+                },
+            ) {
                 Text(text = stringResource(android.R.string.ok))
             }
         },
@@ -95,13 +111,18 @@ fun CategoryRenameDialog(
         },
         text = {
             OutlinedTextField(
-                modifier = Modifier
-                    .focusRequester(focusRequester),
+                modifier = Modifier.focusRequester(focusRequester),
                 value = name,
-                onValueChange = { name = it },
-                label = {
-                    Text(text = stringResource(R.string.name))
+                onValueChange = {
+                    valueHasChanged = name != it
+                    name = it
                 },
+                label = { Text(text = stringResource(R.string.name)) },
+                supportingText = {
+                    val msgRes = if (valueHasChanged && nameAlreadyExists) R.string.error_category_exists else R.string.information_required_plain
+                    Text(text = stringResource(msgRes))
+                },
+                isError = valueHasChanged && nameAlreadyExists,
                 singleLine = true,
             )
         },
diff --git a/app/src/main/java/eu/kanade/presentation/components/DeleteLibraryMangaDialog.kt b/app/src/main/java/eu/kanade/presentation/components/DeleteLibraryMangaDialog.kt
index 1411a5755..52ee61559 100644
--- a/app/src/main/java/eu/kanade/presentation/components/DeleteLibraryMangaDialog.kt
+++ b/app/src/main/java/eu/kanade/presentation/components/DeleteLibraryMangaDialog.kt
@@ -44,6 +44,7 @@ fun DeleteLibraryMangaDialog(
         },
         confirmButton = {
             TextButton(
+                enabled = list.any { it.isChecked },
                 onClick = {
                     onDismissRequest()
                     onConfirm(
diff --git a/app/src/main/java/eu/kanade/presentation/manga/components/DownloadCustomChaptersDialog.kt b/app/src/main/java/eu/kanade/presentation/manga/components/DownloadCustomChaptersDialog.kt
index 5b2b5b6cb..53d594434 100644
--- a/app/src/main/java/eu/kanade/presentation/manga/components/DownloadCustomChaptersDialog.kt
+++ b/app/src/main/java/eu/kanade/presentation/manga/components/DownloadCustomChaptersDialog.kt
@@ -42,6 +42,7 @@ fun DownloadCustomAmountDialog(
         },
         confirmButton = {
             TextButton(
+                enabled = amount != 0,
                 onClick = {
                     onDismissRequest()
                     onConfirm(amount.coerceIn(0, maxAmount))
diff --git a/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsAdvancedScreen.kt b/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsAdvancedScreen.kt
index 92f2053cd..37a2fc56c 100644
--- a/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsAdvancedScreen.kt
+++ b/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsAdvancedScreen.kt
@@ -275,10 +275,6 @@ object SettingsAdvancedScreen : SearchableSettings {
                     pref = userAgentPref,
                     title = stringResource(R.string.pref_user_agent_string),
                     onValueChanged = {
-                        if (it.isBlank()) {
-                            context.toast(R.string.error_user_agent_string_blank)
-                            return@EditTextPreference false
-                        }
                         try {
                             // OkHttp checks for valid values internally
                             Headers.Builder().add("User-Agent", it)
diff --git a/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsLibraryScreen.kt b/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsLibraryScreen.kt
index bae00429a..80ced0194 100644
--- a/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsLibraryScreen.kt
+++ b/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsLibraryScreen.kt
@@ -315,7 +315,10 @@ object SettingsLibraryScreen : SearchableSettings {
                 }
             },
             confirmButton = {
-                TextButton(onClick = { onValueChanged(portraitValue, landscapeValue) }) {
+                TextButton(
+                    enabled = portraitValue != initialPortrait || landscapeValue != initialLandscape,
+                    onClick = { onValueChanged(portraitValue, landscapeValue) },
+                ) {
                     Text(text = stringResource(android.R.string.ok))
                 }
             },
diff --git a/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsTrackingScreen.kt b/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsTrackingScreen.kt
index 91ecac4df..2962c9087 100644
--- a/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsTrackingScreen.kt
+++ b/app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsTrackingScreen.kt
@@ -222,7 +222,7 @@ object SettingsTrackingScreen : SearchableSettings {
                         label = { Text(text = stringResource(uNameStringRes)) },
                         keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
                         singleLine = true,
-                        isError = inputError && username.text.isEmpty(),
+                        isError = inputError && !processing,
                     )
 
                     var hidePassword by remember { mutableStateOf(true) }
@@ -253,21 +253,16 @@ object SettingsTrackingScreen : SearchableSettings {
                             imeAction = ImeAction.Done,
                         ),
                         singleLine = true,
-                        isError = inputError && password.text.isEmpty(),
+                        isError = inputError && !processing,
                     )
                 }
             },
             confirmButton = {
                 Button(
                     modifier = Modifier.fillMaxWidth(),
-                    enabled = !processing,
+                    enabled = !processing && username.text.isNotBlank() && password.text.isNotBlank(),
                     onClick = {
-                        if (username.text.isEmpty() || password.text.isEmpty()) {
-                            inputError = true
-                            return@Button
-                        }
                         scope.launchIO {
-                            inputError = false
                             processing = true
                             val result = checkLogin(
                                 context = context,
@@ -275,6 +270,7 @@ object SettingsTrackingScreen : SearchableSettings {
                                 username = username.text,
                                 password = password.text,
                             )
+                            inputError = !result
                             if (result) onDismissRequest()
                             processing = false
                         }
diff --git a/app/src/main/java/eu/kanade/presentation/more/settings/widget/EditTextPreferenceWidget.kt b/app/src/main/java/eu/kanade/presentation/more/settings/widget/EditTextPreferenceWidget.kt
index 75c416826..6191206ec 100644
--- a/app/src/main/java/eu/kanade/presentation/more/settings/widget/EditTextPreferenceWidget.kt
+++ b/app/src/main/java/eu/kanade/presentation/more/settings/widget/EditTextPreferenceWidget.kt
@@ -1,7 +1,12 @@
 package eu.kanade.presentation.more.settings.widget
 
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Cancel
+import androidx.compose.material.icons.filled.Error
 import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
@@ -50,6 +55,16 @@ fun EditTextPreferenceWidget(
                 OutlinedTextField(
                     value = textFieldValue,
                     onValueChange = { textFieldValue = it },
+                    trailingIcon = {
+                        if (textFieldValue.text.isBlank()) {
+                            Icon(imageVector = Icons.Filled.Error, contentDescription = null)
+                        } else {
+                            IconButton(onClick = { textFieldValue = TextFieldValue("") }) {
+                                Icon(imageVector = Icons.Filled.Cancel, contentDescription = null)
+                            }
+                        }
+                    },
+                    isError = textFieldValue.text.isBlank(),
                     singleLine = true,
                     modifier = Modifier.fillMaxWidth(),
                 )
@@ -59,6 +74,7 @@ fun EditTextPreferenceWidget(
             ),
             confirmButton = {
                 TextButton(
+                    enabled = textFieldValue.text != value && textFieldValue.text.isNotBlank(),
                     onClick = {
                         scope.launch {
                             if (onConfirm(textFieldValue.text)) {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreen.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreen.kt
index e71f43640..245c3e37c 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreen.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreen.kt
@@ -52,13 +52,15 @@ class CategoryScreen : Screen {
             CategoryDialog.Create -> {
                 CategoryCreateDialog(
                     onDismissRequest = screenModel::dismissDialog,
-                    onCreate = { screenModel.createCategory(it) },
+                    onCreate = screenModel::createCategory,
+                    categories = successState.categories,
                 )
             }
             is CategoryDialog.Rename -> {
                 CategoryRenameDialog(
                     onDismissRequest = screenModel::dismissDialog,
                     onRename = { screenModel.renameCategory(dialog.category, it) },
+                    categories = successState.categories,
                     category = dialog.category,
                 )
             }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreenModel.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreenModel.kt
index 1ecb89bbe..643362c4b 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreenModel.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/category/CategoryScreenModel.kt
@@ -47,7 +47,6 @@ class CategoryScreenModel(
         coroutineScope.launch {
             when (createCategoryWithName.await(name)) {
                 is CreateCategoryWithName.Result.InternalError -> _events.send(CategoryEvent.InternalError)
-                CreateCategoryWithName.Result.NameAlreadyExistsError -> _events.send(CategoryEvent.CategoryWithNameAlreadyExists)
                 else -> {}
             }
         }
@@ -84,7 +83,6 @@ class CategoryScreenModel(
         coroutineScope.launch {
             when (renameCategory.await(category, name)) {
                 is RenameCategory.Result.InternalError -> _events.send(CategoryEvent.InternalError)
-                RenameCategory.Result.NameAlreadyExistsError -> _events.send(CategoryEvent.CategoryWithNameAlreadyExists)
                 else -> {}
             }
         }
@@ -117,7 +115,6 @@ sealed class CategoryDialog {
 
 sealed class CategoryEvent {
     sealed class LocalizedMessage(@StringRes val stringRes: Int) : CategoryEvent()
-    object CategoryWithNameAlreadyExists : LocalizedMessage(R.string.error_category_exists)
     object InternalError : LocalizedMessage(R.string.internal_error)
 }
 
diff --git a/i18n/src/main/res/values/strings.xml b/i18n/src/main/res/values/strings.xml
index cd541c66d..e7afd2658 100644
--- a/i18n/src/main/res/values/strings.xml
+++ b/i18n/src/main/res/values/strings.xml
@@ -882,6 +882,7 @@
     <string name="information_empty_category">You have no categories. Tap the plus button to create one for organizing your library.</string>
     <string name="information_empty_category_dialog">You don\'t have any categories yet.</string>
     <string name="information_cloudflare_bypass_failure">Failed to bypass Cloudflare</string>
+    <string name="information_required_plain">*required</string>
     <!-- Do not translate "WebView" -->
     <string name="information_webview_required">WebView is required for Tachiyomi</string>
     <!-- Do not translate "WebView" -->