Eraser on canvas

Hi!
I am trying to make a feature for a school app with a canvas drawing, but I can’t seem to figure out how to add an eraser or some sort of undo button to erase/remove certain parts of the drawing. I can only do clear All.

It’s interesting, because I am using the Drag and Drop builder, and there doesn’t seem to be a drawing feature. Are you using Snap to Place, by chance?