I would like to alter the permissions of the Standard User. Or disable the Standard User

Just to give you the reason behind this request: we have 200+ users from different areas using Fulcrum and we don't necessarily want them to see what the other users are doing. So we don't want standard users to have "Access to Issues & Tasks"

I can create a custom user, but I want to remove the Standard User (or redefine the permissions of it)