Bigger Keyboard for low vision

I got this keyboard and paid for it thinking it would help it the spell check is nonexistent and it makes it even harder to type because of it. I can't even capitalize letters because it's so delayed when I tap the keys. Maybe I haven't played with it enough but I am disappointed so far.

so for people with vision, i can see this being helpful. But as someone with big fingers, this doesn't help. the keys are more tall rather than bigger. If there is a setting that makes them wider as well, then i'm sold. But i don't see anything that lets me do that

I am a terrible speller and need autocorrect. Can you help?