I noticed that use Edit=Allow only autoconfirmed users for items and for pages in the project namespace, but for properties the option seems to be gone. As an admin you can see this at https://www.wikidata.org/w/index.php?title=Property:P3452&action=unprotect for example.
Description
Description
Related Objects
Related Objects
Event Timeline
Comment Actions
This is because the entire namespace has been protected with that same level: T254280.
Comment Actions
This is intentional, since the namespace is protected
See rMW8862991ce1b1: Improve UI for page protection with $wgNamespaceProtection by @Anomie
Comment Actions
Still means the wording of the protect page is incorrect. Currently it says "all users" and "allow only administrators". The "all users" is not correct because changing the protection to that won't make it possible for all users to edit, only for autoconfirmed users and above. I see we have T266394 for that