Resetting Steam Settings. HELP. (Rise of the Tomb Raider)

It seems like it is impossible to throw off the Steam settings, in any case, I did not find such an option. You can reinstall Steam.
The button for taking screenshots changes as follows: Settings -> In the game.

I know that (about screenshots). But, I'm afraid that when you reinstall and enter my username-password, these settings will remain. Your opinion?

ant19521
So why be afraid: either "..the settings will remain ..", or you will get what you need))

It is truth too)). Thanks.

Reinstalled. The screens do not work.

Everything is fine. It was necessary to start, then exit and download again.