How to undo wall placement?

I tried undoing a wall that I placed, so I could make it wide enough for a door. However, when I hit the undo button, it just deselects the building being edited and nothing happens.

Before

After

It took me quite awhile to make the floor design, so I’d rather not start it all over again. Any advice?

There is a hidden eraser in the category with the three blocks in the right

@Powerclank Unfortunately, I ended up restarting. But it’s a good thing to know for the future! So, thank you!

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I had the same problem. I guess it is a bug then.

This eraser has actually never worked on walls for me. So… I don’t know if it’s just me doing wrong or a bug in some games.