Hello @frkorz, this issue is already being tracked at #9273. Closing in favor of the older issue report.
There is a setting at Steam -> Settings -> Interface -> enable Enable context menu focus compatibility mode which might help.
digging through github i eventually found the solution. the steam settings option does not work. i had to set the ubuntu option from focus on hover to focus on click. i dont use focus on click because it wears out my mouse faster. but such is life.
Nothing extracted yet.
the ubuntu 24.04.1 steam ui is broke. in the library when i right click on a game, a menu pops up, when i click on an item, the menu goes away and the click is ignored by the menu and is passed to whatever was under the menu, which just selects another game. using the gear on the right side of a game window has the same behavior. the menu ignores the click and passes it to whatever was displayed under the menu. this items like manage and properties are impossible to access.