Other ways to maximize an open window:
- Double-click the top of an open window just below the top edge. To restore a maximized window to its original size, double-click the top of the window again.
- On the taskbar, press Shift and right-click a taskbar button or a preview of an open window, and then click Maximize.
I was having major problems with the debug window. When I was firing up the debug window (by pressing F12), the window was appearing outside of the screen. I think this problem was caused because at work I had an extra screen and then when I was at home I only had the laptop.
The problem I had was I couldn’t find any way to maximise the screen to bring it onto the main laptop screen.
In the end I found that by pressing the windows key – 
and then down arrow or up key. You can then press shift to go through the screens until you get the developer debug screen.
and then down arrow or up key. You can then press shift to go through the screens until you get the developer debug screen.
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