I put Samsung screen protector on very easy to do no bubbles and works fine with fingerprint sensor working immediately no need to change touch sensitivity .
But on checking spen bottom left of screen couple of spots pen not writing, so did spen diagnostics test in Samsung Members app and all the squares worked with exception of the 2 spots where not writing but they worked when put more pressure on so test all passed. So at this stage hopefully I haven't got faulty phone will need to go and see Samsung kiosk and check out next week when out of isolation, or next thing will have to install 2nd screen protector from pack I ordered.
Loving the phone touch heavier than my Note 10+ and I like now buttons on the right hand side preferable as right handed previously on Note 10+ buttons on left, also screen very easy to see in bright sunlight.