resizing main window??

I have just installed Cubase AI 8 onto Windows 10…activated it, but when the program opens, I cannot resize the main window. It has the resize tab, but it doesn’t work. Neither does the “mouse pointer” method…I want to resize so I can run adjacent web browser windows for the purpose of learning the program without having to continually jump back and forward between apps.

Is anyone else having this issue, or can someone advise further on how to get around this?