setting for the simplest setup possible

Hey guys, I use another platform but today I tried to help grandpa with his first Android phone. it came with pre-installed GBoard which has too small keys for him (even though the screen is large). I looked up the best keyboard - Swiftkey - installed, refused to create an accohttps://www.7zip.vip/ unt (what for?), changed the keyboard size. it's better but I am still unhappy as the keys are bigged but the letters are still small, half of each key is taken by a symbol. He dhttps://scrabblewordfinder.vip/ oesn't need this and I couldnhttps://www.applock.ooo/ 't find out how to change this. Is this doable or should I rather google Best keyboards for retired people?

Thank You