Windowed Mode - Windowed game bounds exceed screen and task bar

• Official comment

  

  Bungie Support

  Marathon Support

  February 27, 2026 15:01

  Hi there,

  Thanks for reaching out and reporting this!

  If the issue persists, could you please capture a brief video that shows the issue in action? You can upload the footage to a public video hosting site, like YouTube, then post the link here and we’ll be glad to take a look.
• 

  Vahl

  March 10, 2026 18:08

  It's just that the game won't snap to an edge of the monitor and there's also no option to simply resize the window. I've tried to change launch options in Steam but the game still is forced to launch at whatever resolution it's set to in game. The bottom part of the game is cut off because of the window screen, there's not much a video would demonstrate. The client simply needs the ability to be manually resized for custom resolutions in windowed mode.This forum also won't let me attach a screenshot for some reason but just imagine not being able to see the bottom 5-10% of your screen.

   

  Yes

  0

  No
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  Osiris

  March 23, 2026 21:42

  I have the same issue. I can't seem to get the game to work fullscreen in my native 3820x2560 it only shows 3820x1600 and it gives me a gap at the bottom of the screen

  Yes

  0

  No
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  7empes7

  March 24, 2026 23:05 (Edited March 24, 2026 23:17)

  Same problem here on ultrawide 21:9 monitor when trying to play 16:9 in windowed mode, the application bar on the top take space from the bottom part of the game.As you can see 2-3 cm on the bottom aren't visible

   

  

  Yes

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  Blackcover11

  April 29, 2026 22:55

  Fix for Windowed Mode Exceeding Screen Bounds on Ultrawide Monitors

  Monitor: Samsung G9 (5120×1440) Platform: Steam

  Problem: Playing Marathon in windowed mode at 2560×1440, the window title bar pushes the game past the bottom of the screen, cutting off the lower portion. The game doesn't allow manual window resizing or custom resolutions through its in-game settings.

  Solution:

  1. Navigate to C:\Users\[YourUsername]\AppData\Roaming\Bungie\Marathon\prefs\
  2. Open the cvars file in a text editor (Notepad works fine). Make a backup copy first.
  3. Change the following values:
     • window_mode from 0 to 1 — this enables borderless windowed mode, removing the title bar while keeping your chosen resolution
     • windowed_resolution_height to your screen's working area height (screen height minus taskbar). To find this, open PowerShell and run: Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.Screen]::PrimaryScreen.WorkingArea Use the Height value it returns. In my case it was 1392.
     • window_position_y to 0 to push the window flush to the top of the screen
  4. Save the file and set it to read-only (right-click → Properties → check Read-only) so the game doesn't overwrite your changes.

  Result: The game runs at 2560×1440 without a title bar, fits perfectly above the taskbar, and the cursor is properly confined during matches. The in-game Window Mode dropdown will appear blank since this is an unofficial mode, so avoid hitting Reset in the video settings or you'll need to re-edit the file.

  

   

  Yes

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  Blackcover11

  April 29, 2026 22:56

  Bungie should add these options in game, but this is the workaround that I found precisely useful.

   

  Yes

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