Given the scant details provided, I can only offer generic troubleshooting.
I recommend the following:
Clean Lightroom Install Procedure
- Close Lightroom
- Restart the computer
- Use the Adobe Creative Cloud App to uninstall Lightroom
- Restart the computer
- Install Lightroom via the Creative Cloud App without launching any other programs.
- Restart the computer
- Launch Lightroom
- Wait 5 minutes
Then:
This procedure works for both Lightroom Classic and Lightroom Desktop.
If you are using Lightroom Desktop, it can change your local storage location. Please review this setting after resetting preferences.
Reset Procedure:
1. Close Lightroom.
2. Hold down [Alt/Opt]+[Shift] while restarting Lightroom.
3. Overwrite the Preferences when prompted by the dialog.
4. Close Lightroom.
5. Restart Lightroom.