To resize a window you:
1. click on the middle button in the upper right corner of the window (it looks like two little windows on top of each other)
2. place your cursor at the edge of the window. It will look like an arrow with two points. Then click (keep the mouse button down) and drag until the window is the right shape!
Try it now!

To open a new browser window go to File/New/Window.
Try it now!
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