You can deactivate permissions for the chat function using the permissions and roles system in COYO.
To do this, you need to remove the permission "Write and receive messages" in the respective role.
To do this, you need to remove the permission "Write and receive messages" in the respective role.
But beware: This change applies to everyone who is assigned to this role.

Note:
Users who have activated the chat function are not shown a message when they write to a user who has not activated the chat function.
Users who have activated the chat function are not shown a message when they write to a user who has not activated the chat function.
You can find further information about the permissions and roles system here.