https://itch.io/my-collections has terrible coding, that coding is not going to get better if the solution is to only have 3 or 4 games.
my prefered way to search for a game in my itch library right now is to simply hit the main page and search then click on the you own it banner to download. also chrome/tabs outliner can be used to create a sort of favorites list, then there is always ITAD.