Describe the bug
A clear and concise description of what the bug is.

While steam is in Big Picture mode (launched with gamescope -e -- steam -bigpicture), the SteamVR menu is scaled a lot and most of the UI is inaccessible due to being clipped. See screenshot for reference

To Reproduce
Steps to reproduce the behavior:

1. Launch Steam Big Picture in gamescope using this command: gamescope -e -w 3840 -h 2160 -- steam -bigpicture
2. Launch SteamVR using Steam Link app on Meta Quest 3
3. Press menu button on left controller to bring up Steam overlay
4. Try to use the overlay

Expected behavior
A clear and concise description of what you expected to happen.

Menu is normally scaled and usable

System Information (please complete the following information):
Please use the latest Steam beta client and SteamVR beta for your bug reports!

• Steam client version (build number or date): 1759461205
• SteamVR version: 2.13.6
• Distribution (e.g. Ubuntu): CachyOS
• Steam runtime diagnostics: [generate via Help -> Steam Runtime Diagnostics in the Steam client]
  steam_runtime_info.log
• Steam and SteamVR logs: [generate by running this command in a terminal tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs]
  steam-logs.tar.gz
• Minidumps: [run the following command: tar -zcvf ~/Desktop/steam-minidumps.tar.gz /tmp/dumps]
  steam-minidumps.tar.gz

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Add any other context about the problem here.