Is your feature request related to a problem? Please describe.
It’s difficult to undo lists and highlight for lines.
Describe the solution you’d like
When you select a word, you can tap B to make it bold. Tapping the same button again undoes the action. This could work with lists and highlight just as well. Tapping the highlight button would highlight the line, tapping it again would undo it.
Do you mean you would like to have similar buttons for Lists (I guess numbered and bulleted, and maybe checkbox?) and highlights in quick action bar? For Lists I can imagine it is easy to toggle on and off, but I don’t really see how that would work for highlights…