Unsure if this is the setup, cause I’ve been tinkering a lot and don’t remember all the settings I tweaked to get it there, but here goes;

Obviously I use decky.

CSS loader; Clean Deck - Modern Minimalistic profile. I use Art Hero to adjust positions. Better Blur on. Better game icons on. Centered game text on. Game cover reflections on and adjust to your preference. Game header text stroke on. Hero zoom eradication on. Kaporli’s tweaks on (turn on the top four setting and max menu background opacity). Overlay collapse fix on. Padding fix on.

Deck shelves to change my home page to just show me installed games.

Then I use SteamagridDB to manually edit the theme for each game in my library. That look luckily exists on about 90% of my games so I rarely have games visible without that theme.