Working version

MainWindow.xaml.cs

@@ -26,6 +26,11 @@ public partial class MainWindow : Window
         EndCardBox.Text = _loadedSettings.EndCardPath;
         FfmpegPathBox.Text = _loadedSettings.FfmpegPath;
         FfprobePathBox.Text = _loadedSettings.FfprobePath;
+        TrimBox.Text = _loadedSettings.TrimStart;
+        FadeBox.Text = _loadedSettings.FadeSeconds;
+        HoldBox.Text = _loadedSettings.EndCardHoldSeconds;
+        IntervalBox.Text = _loadedSettings.ThumbnailInterval;
+        SelectEncoder(_loadedSettings.Encoder);
         SelectTheme(_loadedSettings.Theme);
         ApplyTheme(_loadedSettings.Theme);
         Closing += (_, _) => SaveSettings();
@@ -65,6 +70,14 @@ public partial class MainWindow : Window
         if (dialog.ShowDialog(this) == true) FfprobePathBox.Text = dialog.FileName;
     }
 
+    private void OpenSettings_Click(object sender, RoutedEventArgs e) => SettingsOverlay.Visibility = Visibility.Visible;
+
+    private void CloseSettings_Click(object sender, RoutedEventArgs e)
+    {
+        SettingsOverlay.Visibility = Visibility.Collapsed;
+        SaveSettings();
+    }
+
     private async void Render_Click(object sender, RoutedEventArgs e)
     {
         try
@@ -174,10 +187,16 @@ public partial class MainWindow : Window
             EndCardBox.Text.Trim(),
             FfmpegPathBox.Text.Trim(),
             FfprobePathBox.Text.Trim(),
-            SelectedTheme()));
+            SelectedTheme(),
+            SelectedEncoder(),
+            TrimBox.Text.Trim(),
+            FadeBox.Text.Trim(),
+            HoldBox.Text.Trim(),
+            IntervalBox.Text.Trim()));
     }
 
     private string SelectedTheme() => ((ComboBoxItem)ThemeBox.SelectedItem).Tag!.ToString()!;
+    private string SelectedEncoder() => ((ComboBoxItem)EncoderBox.SelectedItem).Tag!.ToString()!;
 
     private void SelectTheme(string theme)
     {
@@ -193,6 +212,20 @@ public partial class MainWindow : Window
         ThemeBox.SelectedIndex = 0;
     }
 
+    private void SelectEncoder(string encoder)
+    {
+        foreach (ComboBoxItem item in EncoderBox.Items)
+        {
+            if (string.Equals(item.Tag?.ToString(), encoder, StringComparison.OrdinalIgnoreCase))
+            {
+                EncoderBox.SelectedItem = item;
+                return;
+            }
+        }
+
+        EncoderBox.SelectedIndex = 0;
+    }
+
     private void ApplyTheme(string theme)
     {
         bool light = string.Equals(theme, "Light", StringComparison.OrdinalIgnoreCase);
@@ -217,7 +250,6 @@ public partial class MainWindow : Window
 
     private void SetBrush(string key, string color)
     {
-        if (Application.Current.Resources[key] is SolidColorBrush brush)
-            brush.Color = (Color)ColorConverter.ConvertFromString(color);
+        Application.Current.Resources[key] = new SolidColorBrush((Color)ColorConverter.ConvertFromString(color));
     }
 }