Steam Link Screen Size/Resolution

[5h0rty87]

Hi everyone,

I had Retropie 4.5 running on my Raspberry Pi 4 and decided to update to 4.6 yesterday.
I am/was using PINN for dual boot with Libreelec.
In the main menu of PINN I found that Retropie 4.6 could be installed as a standalone version without Raspbian, so I wanted to try that.
So far so good, everything seems to be working fine in 1080p.
But Steam Link is running only in a 1024x768 screen and 3:4 ratio.
I had the same issue when I installed Retropie on top of Raspbian Lite.
When I installed Retropie on top of full Raspbian it was running in 1920x1080.
I tried changing some HDMI settings in config.txt and the video settings in the console before Steam Link starts.
I also checked the settings of Steam and Remote Play. Everything is the same.

Is there anything else I need to change or check?

Thank you very much in advance.

Retropie 4.6
Built from downloads in PINN; standalone, no manual install on top of raspbian
Raspberry Pi 4, 4GB