54 Games Missing From Steam Library
Since Steam forced its new "improved" UI on its users, 54 games have vanished from my library—and that's just ONE Steam account; two others are similarly afflicted. All owned games show up in Games Owned in user profile, but one cannot MANAGE the games (install or launch, et cetera) from there.
Shortly before this new undesired and disastrous change in the UI, I had reset my Steam Library preferences to default, removing all category settings. Now the old settings are back, and it's a hopeless mess.
In all probability a specific filter is set in the new UI, preventing you from seeing all games.
There are several ways this can be changed:
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Maybe the dedicated button to filter out games that are currently unavailable is switched on:
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There is a myriad of preset tags to choose from to filter your game library to create 'Dynamic Collections', and this might have filtered out part of your library:
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Lastly, there is a drop-down menu to the left of the former two options, that allows you to filter software, videos, and tools. The option for 'Games' might be deselected:
I found for me that the "missing games" weren't actually games. I have my library set up into 2 Collections: Favorites and Uncategorized. You can see that there is a lot missing from Uncategorized:
Similar to the answer from @Joachim, if you go into the filter settings and select Unplayed, a new category called "Tools" will appear. Here I see a bunch of dedicated servers for games I've never installed, as well as a few SDK's and other things.
