Firmware handles the OS menus and font rendering.
This means your prod.keys are missing or outdated. Ensure your keys version matches or exceeds the firmware version you are trying to use. Games Not Appearing in List switch firmware download yuzu
Here is everything you need to know about Switch firmware for yuzu, focusing on the legal, technical, and safety aspects of the process. The Role of Firmware in Emulation Firmware handles the OS menus and font rendering