If you are not happy with your on-screen-keyboard (#squeekboard) on Mobian, you might want to try out #phosh-osk-stub which is @agx's toy keyboard. I like the layout a lot, apparently it even features local text prediction (have not tried that yet).
Remember, it is a toy, so hold back on your support requests.

Installation TL;DR: apt install phosh-osk-stub && update-alternatives --config Phosh-OSK