Hi @Jenkler! Long time no see 😁
I don't think we can do this right now, since visibility is handled on the category level.
It could likely be done in a plugin though, to enforce visibility on a per topic level ..
You can set the # of recent replies to 0 in the acp, but then you want see anything there.
Another option is to modify the template https://github.com/NodeBB/nodebb-theme-persona/blob/master/templates/partials/categories/lastpost.tpl#L12 if you remove the content you won't see the post content there.