And thats why it is invisible to my friends what i am playing. Not that i would play any hentai games of course.

What are these “friends” I keep reading about?

Just disable that notification or go offline in the friends thingy.

I don’t understand how after all these years Steam doesn’t have more granular control over what games / activity you show to the world. Why can I just hide some games?

How is this so hard for a small indie company?