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Resize Borderless Fullscreen

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Hi, I've been trying to resize borderless fullscreen games to contain themselves within a specific monitor split, but have so far been unable to. I've googled the topic extensively, encouraged by this response in the steam forums (

What I want to achieve is essentially the ability, either by triggers, functions, or whatever means, to force a borderless fullscreen window to resize itself to fit a desired split (in this case my central 2560x1440 split). So far all of my attempts have been entierly unsuccessful, prompting me to this forum post.

For further reference, I've used functions such as these ( to obtain my desired results accross most games (like Risk of Rain 2, Devil May Cry 5, God of War...), but games such as Heroes of the Storm or Age of Empires II: Definitive Edition very stubbornly refuse to work correctly, either rejecting the borderless command entierly, or alternatively breaking the mouse hitbox when I do manage to get it to work (very inconsistently so).

Any help that allows me to achieve a borderless window experience in my desired split consistently will be greatly appreciated, many thanks!

PS. Attaching my troubleshooting info as I've seen it be commonly requested, hope it's helpful in providing me a solution!
• Attachment [protected]: [45,795 bytes]
Sep 30, 2022  • #1
Keith Lammers (BFS)'s profile on
Resizing borderless game windows is hit and miss depending on the game, but it's not something we can control from our end. All we can do is tell the window to resize, but what it does with that info is up to the game. Some devs might choose to have their game window ignore resize calls, others may just not be compatible with resizing even though they technically allow it (like in the case of the game that resizes but the hitbox is broken).

The best way to resize a game window is to set the size in the game's video settings, but that can be problematic depending on the size of your split.

Sorry I dont' have better news for you!
Oct 3, 2022  • #2
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