Access to the VBS module is managed using secured actions and roles. The majority of users will have access to the VBS to be able to view and/or edit, however if you have a user that requires VBS read-only, then you can set up this type of access.
VBS - Access
Access to the VBS Module.
VBS - Edit BAU
If the user does not have this secured action then they will only have View Only (read-only access).
The user with the VBS read-only secured role, will be able to view the VBS and the View Only button displays.