How Remove Guest permission auto applied to all user in frappe

Issue !! The Guest permission is Applied to all user .
When i Checked All the user has assigned role guest in frappe defautly.But I not found any option to disable.
I have a assigned read permission for project doctype to guest role through user permission to get access to project for all guest.But That permission is also applied to all user so i can’t restrict project access to other role users.Is there is any solution?