I use it on KDE Neon without major problem (but with limitation) for the most part
But …
For you’re 1st point I plug my 2in1 laptop so don’t know
What settings menu?
3-4 point it look like problem you could encounter with X programs.
Are-you on X? Maliit is for a wayland environment.
if you’re on a wayland session, on what program do you encounter this? The problem with the wrong input I encounter this in Chromium wich was running in Xwayland (not wayland then).
You can verify if youre program is running with Xwayland with
I suspect the issue with the incorrect symbols is an xwayland thing – I’ve never had it with native wayland apps.
The keyboard not appearing issue definitely happens in wayland apps.
I don’t know exactly what settings is meant to do, but if you hold down on the emoji key, it gives you a “settings” option, which for me on NixOS results in an error popup window that says “Could not read file settings://system/language.” All I could discern from the documentation was perhaps it is only available on Plasma mobile, either that or it is a NixOS issue.