Prevent a guest user from seeing other users

Good morning,

We have a “Entreprise” account and we would like to block the visibility of guests between them.

Indeed, by going to the “magnifying glass” at the bottom left to search for items on the accounts, we can select “people” and access all the users of the same tables.

However, the guests users for whom we want to open access are customers and not recognize each other…

Sorry for my english…
Thank you for your help,