How to hide Steam activity - PC Guide

How to Hide Steam Games in Your Library to Reduce Clutter

Steam may soon let you hide specific games from your friends

How to hide Steam Game Activity from friends

Steam: How to hide recent game activity & game hours

How to Unhide Games on Steam

How To: Hide, Stop Sharing Gameplay Activity in your Steam Account

How to Hide Your Steam Activity

Steam Sign-Up: How It Works

How to hide Steam games you're playing and game activity from friends - GameRevolution

Even if a friend's game details or entire profile are set to private, you can still see what's on their wishlist through the friend activity page. : r/Steam