I have had the same issue on the Featured Showcase select menu within the profile edit. I was able to work around the bug by shrinking the steam window.
I am able to reproduce this problem. Every time after Steam is startet at max size (1080p) the select menu is broken like this one. After I shrinked the steam client to 1444x793 the select menu is working and by the way folding down not up like the black bar you can see in my screenshot. The widget seems to work stable after the resize, even if I switch to another view and back it works as expected at 1080p.
I can confirm this for quite some time (possible duplicate of issue 3967)
Hello, is anyone still experiencing this issue on an up to date system?
I cannot reproduce the problem anymore. To me it seems to be fixed.
Thanks for retesting @tvannahl, closing.
Nothing extracted yet.
Problem Description
The select input for the day, month, and year fields on the birthdate verification page are 1PX wide.
Steps to Reproduce
Expected Behavior
The normal select menu
Actual Behavior
A 1PX menu
System Information
Screenshot