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Steam :: Introducing Steam Families
(steamcommunity.com)
Welcome to the largest gaming community on Lemmy! Discussion for all kinds of games. Video games, tabletop games, card games etc.
Submissions have to be related to games
No bigotry or harassment, be civil
No excessive self-promotion
Stay on-topic; no memes, funny videos, giveaways, reposts, or low-effort posts
Mark Spoilers and NSFW
No linking to piracy
More information about the community rules can be found here.
You can mark games as Private in your library now. It hides your ownership, play stats, etc. It doesn't specifically say it disabled Family Sharing but it'd be silly to keep that. There is also a Hidden Games section which stops it from showing up on your list.
https://help.steampowered.com/en/faqs/view/1150-C06F-4D62-4966
Edit: I just tested it with current Family Sharing (not this beta version). Both Hidden and Private prevent games from showing on another shared account.