Steam Big Picture mode doesn't scale to 16:10 resolutions if I recall correctly. Is the Moonlight app resolution set to "Default" in the app's properties? Have you actually tried it in-game and changed the game's resolution to a 16:10 one?
Moonlight also must use a 16:10 res using the custom resolution option, 4K, 1440p, 720p, etc are all 16:9.
I had similar issue and solved it by changing resolution via loontlight directly. Ex: streaming to my 4K tv. But tv uses UHD resolution. Changing resolution via pc will not affect anything. But streaming 4k then changing resolution on moonlight settings fixed my issue. To info, i’m using resolutionchanger.exe to stream 800p to my deck ( found it on reddit) and a dummy hdmi for my TV. Monitor resolution goes to 800p while streaming to deck and moonlight resolution also set to native. Dummy hdmi resolution is 4k and tv resolution changed from native to 4k.
Tltr: check your resolution in moonlight settings.
Steam Big Picture mode doesn't scale to 16:10 resolutions if I recall correctly. Is the Moonlight app resolution set to "Default" in the app's properties? Have you actually tried it in-game and changed the game's resolution to a 16:10 one?
Moonlight also must use a 16:10 res using the custom resolution option, 4K, 1440p, 720p, etc are all 16:9.
I had similar issue and solved it by changing resolution via loontlight directly. Ex: streaming to my 4K tv. But tv uses UHD resolution. Changing resolution via pc will not affect anything. But streaming 4k then changing resolution on moonlight settings fixed my issue. To info, i’m using resolutionchanger.exe to stream 800p to my deck ( found it on reddit) and a dummy hdmi for my TV. Monitor resolution goes to 800p while streaming to deck and moonlight resolution also set to native. Dummy hdmi resolution is 4k and tv resolution changed from native to 4k.
Tltr: check your resolution in moonlight settings.