Hello @Jradah Anis
Since this is not expected behavior, could you please check with other users on the site (Site Owners or Members) to confirm whether they can still see the Settings (gear) icon?
Also, please open the SharePoint site in a private browsing session (such as Edge InPrivate or Chrome Incognito mode) and verify whether the Settings icon is displayed. If it appears there, the issue may be related to browser cache. In that case, please clear your browser profile cache for All Time and check again.
If the issue persists after clearing the cache, please contact your IT Administrator and ask them to verify whether the same behavior is occurring on other SharePoint sites.
As a workaround, you can access the Site Settings page directly using the following URL format:

If you have any updates on this matter, please feel free to let me know.