What do you mean by screen/cover? If you mean the literal screen, do not attempt a repair yourself. Just get it repaired by an official Samsung repair center if you need your screen replaced.
It's not recommended especially if your device is rather new and still under warranty. Any repairs should be carried out by Samsung customer service centre.
Do you mean the actual screen which should only be repaired professionally as mentioned or possibly the theme, if the latter yes think it is a good idea to change this periodically and there are better ones the standard ones you will have on your Device. some information here https://technastic.com/best-samsung-themes-one-ui/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
