: Grab a GTK 3.0 or 3.20 compatible theme (usually a .zip or .tar.xz file).
: Save your settings and restart the app to apply the changes and avoid UI glitches. The "Switch Look" vs. UI Themes ryujinx themes download
: Move the extracted theme folder to a permanent location on your PC. Note: Do not place it inside the Ryujinx installation directory, as updates may rename or delete these files. Enable in Settings : Open Ryujinx and navigate to Options > Settings > General . : Grab a GTK 3
Find the section and check the box for "Use Custom Theme" . UI Themes : Move the extracted theme folder
: If buttons disappear or text is unreadable, the theme may not be fully compatible with Ryujinx's GTK implementation. Try a "compact" version of the theme if available.
: Every time you update Ryujinx, verify your custom path still points to the correct folder, as updates can sometimes reset configuration paths.