The ability to show/not show content in the App Contents Panel in the New UX

In the original UX, the ability to customise what is shown in the contents panel by role is really valuable. In the new UX It would be great if you could also have the ability to customise which pages are shown in the apps contents panel by role. At the moment, end users see all pages that have been built in an app and it can be very confusing given that they may only have access to see data in a couple of them. This added feature would add another layer of security, whilst reducing the visual load for end users.