Full screen mode is no longer possible?

Since yesterday suddenly my full screen mode s.PC no longer works. Whether on Netflix, Youtube or other sites. What could that be? I have already done a virus check.

So F11 is not working anymore?

Which browser do you use?

So that's pretty funny. F11 only works on some pages. But what I mean is the full screen button on the bottom right. Double-clicking is just as little. I'm pretty baffled.

Chrome

If it is in the browser I would look through the setting of the browser for "full screen mode disable" if it does not work I would reinstall chrome.

There are 2 solutions for this:

http://www.wikihow.com/Fix-the-Google-Chrome-YouTube-Fullscreen-Glitch

In German:

Disable flash plugin
or force the video platform to HTML5 video (you can set it in the Youtube account settings, at least on Youtube)

I got it. Just went up on the tab "Zoom" and it works again.