double-check you’resigned into your Steam account and, of course,connected to the internet.
In the View dropdown list, click theHidden Gamesbutton.
It’s the second entry in the menu.

In the new window, you’ll find all your hidden games.
To return to your normal Steam Library, click theShow all collectionsbutton on the left side of the program.
you’re free to also tap the filter button next to the search box to apply filters.

you could also view hidden Steam content within this window, like soundtracks, software, or tools.