Still an issue for me.
2k same issue
Having the same issue on ubuntu 26.04
This happens to me.
Some Information:
I notice that the normal overlay is really small as well, not only the big picture overlay. In the big picture overlay if I go to Settings -> Accessibility I notice that the UI Scale is set to the lowest value. I can change this value but no changes are reflected in the UI and closing and reopening the overlay will have it show at the smallest value again.
Same issue, CachyOS, wayland. KDE 6.7 using 4K resolution.
Found the root cause and a workaround:
The overlay renders at the Wine prefix's DPI, not the system DPI. The default LogPixels value in Proton prefixes is 96 (100% scaling), which makes the overlay tiny on HiDPI displays.
Fix: Edit compatdata/<appid>/pfx/user.reg in your Steam library and change:
"LogPixels"=dword:00000060
to:
"LogPixels"=dword:000000c0
(0x60 = 96 DPI / 100%, 0xC0 = 192 DPI / 200%)
This fixes the overlay scaling without affecting the game itself (most games ignore the system DPI setting). This also explains why the issue only happens on some games — the LogPixels value can differ per prefix depending on how it was created.
Those are valuable insights! I'm gonna try it later. Thanks a lot!
Another thing you can try is I noticed that enabling wine wayland also fixes this.
PROTON_ENABLE_WAYLAND=1
This isn't a Linux specific problem. If I bring my PC to my 4K TV, running Windows 11 & using big picture mode, I get the same the results. If the resolution of my display is set to 4K or 1440p, the scaling of the overlay ignores the Windows'/System's default scaling
Happens for me in deadlock only, tested DDnet and n++(both native and proton scale fine). Putting deadlock in windowed mode and adjusting the slider adjusts the scale, it's just very tiny "LogPixels" same for all games. Resolutions and rendering backends have changed nothing.
Can you test if the overlay scale adjusts in settings>accessibility?
Yes, it adjusts, but when making it the right size, and then closing the game, the whole Steam interface becomes too big. When making the Steam interface the right size again, and opening certain games, the overlay is too small again. But changing the scaling of the wine prefix works thankfully, independent of the Steam interface.
PROTON_ENABLE_WAYLAND=1x1 2026-07
I'm having the following problem:
When running the Steam Linux client (I'm running CachyOS), I can thankfully manually set the interface size of Big Picture mode, cause with the default, everything is way too big on my 4k monitor. Often things are too small on 4K monitors, but in this case everything is too big, but there's a setting for that, so we can change it manually.
But during games, the overlay is way too small. I have set 200% scaling in the KDE settings. I'm running CachyOS. Opening the games in Steam desktop mode has the same result, the overlay is way too small. Whether I run Wayland, or X11, doesn't matter, cause the problem is the same.
So Big Picture Mode on 4K scaling is way too big. But I can manually set a smaller scaling. But then the Steam overlay in games is way too small. The following pictures will show it.
Correct scaling in Big Picture Mode (after having manually set it)
Incorrect scaling overlay during games
When using automatic scaling instead, the Big Picture mode is much too big, but the overlay is still too small during games. Thankfully we can set the first one (Big Picture mode) manually. But not the second one (overlay during games).
Or am I missing something?
UPDATE: I thought I had the problem on all games, but I now notice it's only on some games, so it isn´t exactly consistent. What can we do if we notice the overlay is too small? Can we put in some environment variable for the specific game, that solves it? Please let me know! Then we can close this.