layout component toggle fullscreen?

That’s great if webix provide component fullscreen function.

There’s a fullscreen command that can be called before the application init to adjust it to the screen size: http://docs.webix.com/api__ui_fullscreen.html

Like this GitHub - code-lts/jquery-fullscreen-plugin: This jQuery plugin provides a simple to use mechanism to control the new fullscreen mode of modern browsers

Nope, there is no support for this functionality
The above plugin is just a wrapper around native requestFullscreen functionality.