Multicanvases are one of the cool innovations in Magma. But there are some disadvantages in using it. One of the situations is to switch between canvases forever. Let me explain the situation:

You're using multicanvas. For example, you've created two canvases and you're drawing on one of them. And all of a sudden, you need to use a lasso to select the fragment you want to touch up (by expanding it or narrowing it down later). And before you have time to change the fragment a little, your canvas crashes, as if you wanted to switch to another canvas. That is, the multicanvas function is very sensitive to mouse clicks, which counts as if you want to exit this canvas and move to another canvas.

Therefore, if possible, make special keys to switch or exit the canvas so that it does not react at all to mouse clicks. Or to alleviate this situation in another way.