Your system information

• Steam client version (build number or date): Mar 29, 2023
• Distribution (e.g. Ubuntu): SteamOS
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

After exiting a game that is running with Proton, I want to try running with a different Proton version. I go to game properties, compatibility, and see that the dropdown for selecting Proton version has mysteriously disappeared with no explanation.

This happens even when Steam itself detects that the game is not running and displays the Play button in the library page. It seems that the compatibility settings use some other, faulty mechanism to detect if the game is running. Or perhaps there is a UI bug where Steam forgets to unlock that UI after a game exits.

I expect the compatibility UI to not change at all whether the game is running or not. If I attempt to change the dropdown, that's when Steam should check whether it's running. If it is, Steam should display a clear error message and revert the dropdown to its previous value.

Steps for reproducing this issue:

1. Set game to run with Proton.
2. Observe that Steam displays green Play button.
3. Start game.
4. Observe that Steam detects the game is running and changes to blue Stop button.
5. Exit game.
6. Observe that Steam detects that the game exited and displays green Play button again.
7. Attempt to change the game's Proton version.
8. Observe that the dropdown has disappeared with no explanation.