Laptop Screen Size

If the problem continues, rather than maximizing the IE window with the Maximize (X) icon (which disallows some of the functions you normally have), use one of these other methods to permanently maximize your window:

1. Right-click the Desktop IE icon or IE in the Start Menu, and click on Properties at bottom of the menu. In the Properties window select the Shortcut tab. Open the ‘Run’ drop-down menu and select: Maximized. Hit: Apply, OK

2. Maximize the IE page with the Maximize 1 icon, then hold Shift and close with the X. Next time it opens it should be maximized.

3. Maximize your IE window size by dragging each of the 4 edges of the window all the way out to the edges of the screen. Then hold down the Alt key and press the "X" close button. Next time you open that link it should open in the maximized size, the way it was when you closed it!

4. Maximize your IE window size by dragging each of the 4 edges of the window all the way out to the edges of the screen. Then, while holding the Ctrl + Shift keys, close it by clicking File, Close. You might have to do it a few times to make it learn. If this doesn't work, try again, but this time, still holding the Ctrl + Shift keys, close they maximized window using the X icon.

For further guidance, take a look at this tutorial:
How To Open A Program In Minimized, Maximized or Normal Window