Steps for Camera troubleshooting do the following steps.
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1 go to settings app then camera app storage and clear all cache.
2 back to app in setting tap on three dots and reset set app preferences
3 open to cameras, camera setting and set to default.
After doing then use your phone in safe mode and then open your camera app again and check your camera quality.
This will help you and if not then contact Samsung care at 18007267864