I’m a daily Krita user on a Samsung tablet.
Start with the toolbars; you can add or delete a multitude of actions there. A lot of us put the most commonly used tools in the toolbar (freehand brush, tool options docker, selection tools, deselect, etc.) then we paint in canvas only mode which is accessed by a 4-finger tap. To edit the toolbars: Settings > Configure toolbars.
I have 2 Krita instances on my tablet: 5.2.14 and I also load the 5.3 pre-alpha nightlies to try out. When 5.3 stable version is released next year (lol I forgot we’re already in 2026 - it’s coming out early THIS year), you’ll love the ability to action several dockers via the popup up palette (single finger tap).
At some point, Krita Android will get a mobile makeover as right now it’s simply the desktop version ported to Android.
In the meantime, I hope you enjoy Krita.
There was a good post about customizations just a few weeks ago. I’ll see if I can find it for you.
EDIT:
Here’s the link I was thinking of. It was written for 5.3 but the info is still good for today’s stable version. The member has some great ideas for workspace customizaitons.
Krita 5.3 on android is looking good