Welcome maroner pierre,
Thanks for reaching out to Microsoft Q&A Forum. I understand that the Pin to Start option is not appearing for Settings pages such as About, Windows Update, and Windows Security, and that the previous Registry, Group Policy, account, and Windows version troubleshooting did not resolve it.
Please try the step below to troubleshoot the issue:
1, Check Windows system components
- Open Command Prompt as administrator.
- Run
DISM.exe /Online /Cleanup-image /Restorehealth - After it completes, run
sfc /scannow - Restart Windows after both commands complete.
2, Check the behavior from Windows Search
- Press Windows + S.
- Search for Windows Update or Windows Security.
- Right-click the matching result and check whether Pin to Start is available.
3, Avoid making additional Registry or Group Policy changes for now
- This will help determine whether the current behavior can be reproduced with the standard Windows configuration.
Looking forward to your update.