This remains the most active hub for custom themes. Users frequently share "Pikachu," "Retro," and "OLED Dark" themes in the dedicated MMJ themes channel.
Finding a direct "download and install" link for a theme is different from standard Android apps. Themes are usually shared as ZIP files within enthusiast communities: citra android themes link
If your theme makes the screens look misaligned, use the Custom Layout option in settings to resize and drag the top and bottom screens. For precise control, users can edit the qt-config.ini file located in the config folder to manually set layout values. This remains the most active hub for custom themes
For those looking for a "Classic 3DS" look, there are official 3DS theme archives available for download. How to Install Themes on Citra Android Themes are usually shared as ZIP files within
Download your preferred theme ZIP file.