For RPG Map editor there is a menu on the left side with some GROUNDs hidden below my screen.

When I hover my cursor over it and scroll down nothing happens.

How do I get down there?

I choose 2 cutom colors for a floor tile then I cannot choose any other ones. The paint easel icon has disappeared below my screen. I cannot scroll down. I cannot delete the old colors. I cannot make my window bigger than my computer screen and move it up, it won't let me.

I'm having the same problem. Can't see anything below the Grounds. 

I have the issue here too, the UI should scale to the resolution of the window. Or at least have a scale option somewhere