Keep notification pop-ups with tool instructions visible at all times

[GabrielMajeri]

When I pressed on the "draw walls" button, a notification popped up explaining how to use this tool. However, after clicking around for a bit, the notification disappeared and I forgot what I had to do to exit the tool 😅

I think it would be more helpful to keep this notification (or some similar info display) visible at all times while using the tool, so the user doesn't have to remember what was initially written on the popup.