I'm constantly seeing dupes for "Tennis Trivia" and "Battlerite - All Champions Pack" and it's getting annoying needing to constantly scroll past them =/
if you have the indiegala helper extension installed in your browser, you can select it to hide games you own, but i don't know of a way to hide content you are uninterested in
Sadly the Firefox version is out of date and just plain broken anyway
You'll need a Chromium based browser (including Chrome and MS Edge) and the Chrome extension instead.