You can mark specific games as private and have it fully hidden on your profile: https://help.steampowered.com/en/faqs/view/1150-C06F-4D62-4966
Wow, I did not know that, thanks! But also, wow, I am dumb cause that feels like an easy google search away
No worries! The private game feature only just recently got released on the 4th March update, so it's brand new!
