ISSUE
When using Steam Big Picture mode, any widgets you have on your desktop in macOS will remain visible in the background.

OS
macOS Sequoia Version 15.6 (24G84) — latest as of writing

STEAM BUILD
Steam macOS Beta (running on Apple Silicon) 1753403107 — latest as of writing

STEPS
- Add widgets to Mac desktop (open Notification Centre on right and select edit widgets). Make sure these widgets are along the edge of the screen
- Open Steam
- Launch Steam Big Picture

RESULTS
The background behind Big Picture will turn black but the widgets on the desktop will remain visible.

EXPECTED
The background should be uniformly black, without visible widgets.

SCREENSHOTS
https://imgur.com/a/steam-big-picture-bug-report-4X8CIQw