See if
WindowsKey + Down Arrow or
WindowsKey +
Up Arrow helps. Sometimes 2 in a row is called for.
Try Ctrl+Shift+RightArrow to scroll right, and left to scroll left.
The three states of a window, as far as I can find, are minimized (Task bar only), restored (variable size), and maximized. Restored seems like an odd term, so maybe there is another term for that.