Ok, so when you tap 'done' in the top right, what happens?
The side tool bar still there when I paint
Okay, I'm confused Which side tool bar, and how are you able to paint with the preferences menu open?
Are you seeing a sidebar with a list of shortcuts to other apps/another app open? That would be the iOS split screen option. You can permanently disable it under Settings > General > Multitasking (disable 'allow multiple apps')
Aaaah! That makes a lot more sense. Yes, you can shrink that (it should also vanish when you paint under it as well).
Tap on the current tool in the bottom left to hide the tool bar. Tap on the current color on the right to hide the color picker. Tap on the screen with three fingers to hide/show the bottom menu bar (you can hide/show each one separately).
Ok. I got that. So it still have to manually tap it. Thanks. I thought when my brush goes over the tool panel side/edge, it will just hide.