+ button should be disabled with "Restrict content creation"
Users belonging to tenant with "Restrict content creation - Only admins can create and delete first-level folders, files, and bookmarks" setting enabled can see "+" button for adding content on their root folder screen of Box for iOS mobile app.
They can operate through "+" button, but it fails due to the restriction.
The customer believe that "+" button should be grayed out if this restriction is in effect.
The customer wants the same to happen because "+" button is grayed out in the folder that the user is accessing with VIEWER privilege.

Hello,
thank you for sharing this idea with us.
This suggestion is not yet under consideration for the current or future roadmap but our Product Team will investigate this suggestion and share an update within 1-2 months.
Thank you for helping make Box better!
Cheers,
Klaudyna