I have not opted in Steam Beta and have this exact issue since the last update
Also got the same issue since last update, non-beta, on debian unstable.
Same issue now also on latest stable steam client on Debian 11:


Same on Fedora 37.
Scrolling to the bottom of the page fixes it momentarily?
Same issue here, latest stable client on OpenSuse Tumbleweed
Closing as fixed in the 2023-06-14 Steam client update.
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
Since the latest update (Beta Client Update: March 14th) the UI rendering in the game library got screwed up a little, there's a solid black bar at the bottom and at the top you're unable to see some content / scroll fully up (probably the amount of pixels the black bar at the bottom consists of?).
Steps for reproducing this issue: