It's a basic screen protector. You can an keep it or remove it, it's fine either way. Personally I'm not a huge fan of screen protectors, but I will try it with the pre installed one first, and if I don't like it I'll take it off. I've used Note 9 for 6 months without one and it got some minor scratches, but nothing too serious or noticeable.
I have the S10e and was wondering the same thing. I was with Samsung customer support chat she said it is removable I have a scratch on pre installed already. Furthermore the tempered glass that I have is crying for a screen.