Fullscreen???

[charles cross]

Hello, when I get into zabbix's code, I see that it`s a Fullscreen mode that will take off the page header menu, or something like this. I need in some map's screens to make a full screen view, and I was trying with JavaScript, but if I can make it possible without JS it will be better.
What is the way for showing this Fullscreen mode?
Thankyou!

[Alexei]

Just click on the screen name to enter the full-screen mode.