In a first step try to reset the preferences to the default settings by doing the following steps:
- Close Lightroom.
- Windows: Hold down [Alt]+[Shift] while restarting Lightroom.
- Overwrite the Preferences when prompted by the dialog.
- Close Lightroom.
- Restart Lightroom.
It's recommended to backup your preferences before you reset the preferences to the default settings:
https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html
If this doesn't help try to restore a catalog from the recent backup or try to create a new catalog. Hold the Ctrl-Key while starting LrC. This opens a catalog selection dialog. Create a new one and see if this catalog then works. You could then try to import your current catalog into the new one.
... The App version is up to date (V 13.3)
By @graehamk92702154
Your installed version of Lightroom isn't up-to-date. The latest available version is 13.5.1.
Try to update your version and check if this help.