You do not need to re-install the whole OS. Although that is Apple's official solution if it really has become totally corrupted, it is unnecessary and dangerous.
If it is only settings, then deleting a couple of 'plist' files will present a 'fresh' setup.
If the app itself is corrupted (unlikely), there is a tool you can use to selectively replace macOS or app files.
It’s available for a free trial. I've used it a couple of times, but watch the YouTube videos to double-check the steps…
Pacifist
https://www.charlessoft.com
Good luck.