Your system information

• Steam client version (build number or date): 1646527495
• Distribution (e.g. Ubuntu): Gentoo
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

ComboBox with compatibility tools select is broken in tenfoot mode, works with desktop interface

Steps for reproducing this issue:

1. Open Big Picture mode
2. Select Windows game
3. Open Steam Play settings
4. Click on combobox