FCPX Missing Color Wheel options

Reset your settings to start. Hold ⌥ ⌘ as you double click the library you want to open to launch the application. A dialog appears asking you if you want to Delete Preferences. If you don't do this while double-clicking your library, the application will open a default Untitled  library.  

Simply moving the app to the trash does not remove lots of very important parts of it from your system.

Get "FCS Remover" free from Digital Rebellion. It will totally remove all traces of the FCPX application from your system. It will not touch any of your Libraries, will not touch your third party templates. totally safe to use. Reboot the Mac, then go to the App Store and reinstall FCPX from scratch, including all the extra content.

https://www.digitalrebellion.com/fcsremover/

What FCP version? What OS version? Post a screenshot of what you see.

When the preferences are reset the application opens a default Untitled library. Find your library and open it.

Try reinstalling the application. None of your settings will be lost.

The plugins are not part of the application.