How to “resize” a window
Once you get the hang of the “Restore down” window button (-click the middle of the top right buttons for minimise/maximise or restore down/close), you may then want to make the window bigger or smaller, depending what else you have on the screen. Hover the mouse over one of the window borders until you see a double-sided arrow appear. Once it does, press and hold down the left mouse button whilst dragging left/right/up/down to resize the window. Release when it is a size that suits you.