To fully uninstall, you must remove files located in your user and system Library folders.
If you are looking to fully uninstall FontBook 5.3.1 (62) and clean up your system, follow this guide to remove all its components. Why Do Leftover Files Remain? FontBook 5.3.1 (62)
FontBook 5.3.1 (62) is a specialized font management tool for macOS. While functional, removing it can sometimes leave behind residual files—such as preference files and application support data—that consume unnecessary disk space. To fully uninstall, you must remove files located