EDITOR, GEOMETRY

When i try to use the geometry everything i try doesn't work. It doesn't matter what value i use, one click or hold it just makes a hole to the grid below. Then when i left click it drops the tile from the rest of the map. I have tried turning off the steam overlay, but still same. Any help would be awesome.

@bar0n75 do you have the STmod installed on your editor? that sounds like it's the problem.