Published posts can still go through moderation and can be hidden by admins or moderators, if necessary.
When a published post is hidden:
Regular members won't see it in their Feed or Posts blocks, although the post still exists in the community (for the records and data).
Hidden posts will not be discovered in search for all users.
The member can still see their post even if it's hidden, but there will be no indication that it was hidden for the user.
The hidden posts will still be visible to moderators and admins in the feed or posts blocks, in case they need to take action on the posts later.
How to hide a post:
On the Post> click on [...]
Click on Hide
Once hidden, a new hidden icon will be shown on the Post.
How to unhide a Post:
On the Post> click on [...]
Click on Unhide Post
The post will unhide and the hidden icon on the Post will be removed.