Run in borderless full screen window display
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "user_settings.config" file in the "/%APPDATA%/Arrowhead/Gauntlet/" directory. Change the borderless_fullscreen = false line to borderless_fullscreen = true. Also, make sure you have fullscreen = false defined in the file.