I'm not sure if this is a question, but it seems so obvious that I can't imagine its a bug as I can't see it mentioned anywhere on github.
When I have a passage with a reasonable amount of text, I click the arrows button to increase the size to full screen, but the cursor position jumps to some random location. The issue then is you have to type something to get it to appear and be movable, which ends up usually breaking something as you've added unwanted text/space whatever.
I've tried the application, and the browser, and both do the same (Chrome and Firefox).
Has anyone else seen this, is it something I'm doing? Driving me nuts!