Late last year, I’d posted some “hacks” I’d found to get the drop-down menus working to keep from disappearing on the Steam client ( Hyprland: How I fixed disappearing drop-down menus ). I’m finding with Hyprland version 0.42, the Steam client is doing just fine without and special commands from me. I’m guessing it’s the switch to aquamarine.
Anyway, looks like it works with no special configuration now.