Ohhh, I see, you're talking about version 0.2. Sorry, I said the possible troubleshooting method for version 0.3. And I'm sorry to say that, but this kind of problem hasn't arisen before, so in version 0.2 there's no fix for it, if even moving the window doesn't help. But I assure you that in version 0.3 the fullscreen mode will work just fine😇
I'm sorry if this is not the most reassuring answer, but if you decide to go with the new 0.3 version, I promise you won't regret it🥰