This also can often work:
Open the IE window normally> Drag the corners of the window until it fills the screen> While holding down the Ctrl key (keep holding it down), click on File, then Exit on the menu bar in upper left.
Don't close it using the X in the upper right, use this method. If it doesn't change, this can also work using the shift key instead of the Ctrl.
Good luck, this "problem" is as old as the internet