Can I make Steam give me a description or screenshots of a game when browsing my library?
Solution 1:
The Library page for a game is generally geared towards people who already own that game, which is why it contains things like news, achievements, etc. And unfortunately, no, it's not customizable.
There is, however, a page in Steam for every game that gives a description, shows Screenshot, etc. The game's Store Page. And the library page should generally always contain a 'Store Page' link. It's not quite what you wanted, but it's AFAIK as close to what you asked for as Steam has.
Solution 2:
If I understood your problem correctly, you have 2 solutions
- First display only installed games. See screenshot below (In red on the left)
- Second : Change the layout of the Library. See screenshot below (In red on the right)