Steam client version (build number or date): Oct 8 2020, at 22:08:00
Distribution (e.g. Ubuntu): Pop_OS! 20.04
Opted into Steam client beta?: Yes
Have you checked for system updates?: Yes
Please describe your issue in as much detail as possible:
I am using X with 3 side-by-side 1440p monitors, all connected by DisplayPort directly to my graphics card. The left monitor is my primary display. Here is a screenshot of my display settings:
When I open a game's Steam store page and try to fullscreen a video, it works correctly on the right and center monitors. However, trying to fullscreen on the leftmost 'primary display' results in the video going fullscreen on my center monitor, like so:
If I make the center monitor my 'primary display,' then Steam store videos will fullscreen correctly on the left and right monitors, but the center 'primary display' will open the video on my left monitor.
Steps for reproducing this issue:
Open any game store page on the Steam store, for example Total War: WARHAMMER
With Steam open in your 'primary display,' try to fullscreen a video, and watch it open on the wrong monitor.
Your system information
System Information Gist
Please describe your issue in as much detail as possible:
I am using X with 3 side-by-side 1440p monitors, all connected by DisplayPort directly to my graphics card. The left monitor is my primary display. Here is a screenshot of my display settings:


When I open a game's Steam store page and try to fullscreen a video, it works correctly on the right and center monitors. However, trying to fullscreen on the leftmost 'primary display' results in the video going fullscreen on my center monitor, like so:
If I make the center monitor my 'primary display,' then Steam store videos will fullscreen correctly on the left and right monitors, but the center 'primary display' will open the video on my left monitor.
Steps for reproducing this issue: