How Many users are allowed? Unlimited!
You can invite as many users as you want and the discretion of what all the users should have access to rests with you. You can decide if the user is to be provided with full access, read only access, restricted or no access. This setting of access level can be either practiced either throughout the application or by restricting the access to different areas.
If you have no/restricted entry to a particular menu, you can avail the permission to access the same from an authorised supervisor. The requisite of permission to access a menu shall be indicated and and displayed to you as a message. The authorised person can also decide whether or not to edit your access level as circumstances demand.
Authorized persons can grant access to Menu Permissions of high significance to the users which shall be subjected to scrutinized discretions of that person. However, the authorized persons will be alerted with certain facts to keep in mind while granting permission in certain specific areas which is clearly mentioned in the app.