Erasing specific walk-behinds

[GooseKult]

Hi,
Is it possible to select one specific walk-behind (eg ID3) to isolate and erase or are all 'layers' always merged into one while in erase mode?

I have accidentally filled the entire room with a walk behind and its going to be some work to redo everything!

[Gilbert]

I'm to lazy to check the UI ATM, but can't you just fill the unwanted colour with colour/area #0?
Colour #0 is just 'non-walkable area'.

[Khris]

It's a single layer, so the only way to undo this is to click the undo button. If it's too late for that, I suggest using a paint program instead and importing the mask instead of painting it in the editor.