If the uninstall button is missing, the update might be permanent (a system requirement) or the uninstallation files may have been cleaned up by a system maintenance tool. In this case, using System Restore is your best alternative.
Once you successfully roll back, Windows will likely try to download that same buggy update again. To stop this, you should temporarily pause updates. Go to Settings > Update & Security > Windows Update. windows 10 roll back updates
