Undo button for mistakes in segmentation

Hello, I’m doing a manual segmentation in 3D slicer and I made a mistake with the brush tool, how can i undo this action? There’s a yellow button in the segmentation module that seems to be an “undo option” but it doesn’t erase what I just drew in the image, there has to be a way to erase what you draw, just like in paint. Please help.

Did you happen to see my response on the other thread you posted on? Could you reply to my comment here so we can learn more details?