Prevent Autocomplete of Users and Groups

Hello, I am seeking advise on how to prevent users from listing other users/groups within Nextcloud.
On a previous installation I know there was an option where I checked the box and did not have the option to autocomplete users/groups; I had to type the entire user/group name before I could select it.
This was not just for sharing but for any field where users/groups are searchable (including for admins).
In NC 14.0.4.

Does anyone know where this option is? I can’t find it in any documentation.