When a client has too much content on a screen, the scroll bar only appears when the user begins to scroll in that area. This happens a lot on mobile and request comes every so often to have scroll bar be visible for users.
Allow option in brand/experience design to allow scroll bar to be visible and give user option to change background color of the scroll bar and the scroll indicator as well. That will appear on the right hand side of the screen.
Strong agree on this!