In applications like adobe premiere pro there is a way of popping out the video preview pane and moving it to another monitor, can i do this to the viewport in UE4?
Yes you can. Just click the little orange arrow top left and when you see the viewport tab you can click and drag it.
Mind you the viewport is bound to the Main Window. So the moment you go into blueprints the viewport will disappear.
A better way of going about it is to seperate your tools like modes, content browser and that stuff from the main window.
That way you can always have view of the viewport.