KrzysztofKl wrote:
Thank you for your reply.
I did reinstall the macOS - the result is exactly the same.
Unfortunately no change. Still no system setting panes :(
Any other ideas?
Best,
Krzysztof
Uninstall all third party apps that are Cleaners/Optimizers/Anti-Virus/VPN and test.
all known to cause issues on the macOS
Besides your Safeboot as you mention above, to trouble shoot further you can:
—Test issue in another user (or guest user) account Change Users & Groups settings on Mac - Apple Support
This will tell you if it a universal issue or isolated to your user/admin account.
If no insight or resolve:
You can get a good look at your System config. and reveal conflicts or issues, you can download/run this trusted utility https://etrecheck.com
If you need help interpreting the report you can post it here in its entirety in the "Additional Text" box in the editing toolbar below, in your reply.