There are some tricks for opening a webpage in full screen which might work only for some windows but not for all the Internet Explorer windows. Try this option to set all Internet Explorer Windows maximized.
It is very simple, please follow the below steps:
1. Open Internet Explorer and press F12 to open Developers tools windows for Internet explorer.
2. Click on Tools and select Resize.
3. Select the maximum screen resolution size you have.
4. Close the Internet explorer and reopen it to get the maximized windows.
From now you will be able to open any Internet explorer windows in maximized size even if you open a link right clicking on it and select "Open in a new window".
I hope this helps!
Brett M,
Windows Outreach Team