So...I just posted a "Help with Snap!" topic about a project I started working on yesterday, and when I returned to the project editor (in another tab), I was trying to find alternate solutions while I waited for a response. Then suddenly, the entire editor shrunk into a square.
Occasionally this happens to me, too. Honestly, I think it's more browser memory related (though I think it has also happened on Edge), so I haven't bothered to report it.