Have you trashed your prefs yet?
Following is from Adobe Support page: https://community.adobe.com/t5/premiere-pro-discussions/faq-how-to-reset-trash-preferences-in-premiere-pro/m-p/8236158
Press Alt (Windows) or Option (Mac OS) while launching Premiere Pro. You can release the Alt key or Option key when the splash screen appears.
To reset preferences and plug-in cache at the same time, hold down Shift-Alt (Windows) or Shift-Option (Mac OS) while the application is starting. Release the Shift-Alt keys or Shift-Option key when the splash screen appears.
If you don’t see the list of your recent projects on the Welcome Screen the next time you launch Premiere Pro, the preferences were reset correctly.