Lock down menu item features behind a "Lockout Page" The Lockout Page Themes allow you to 'lock out' your SaaS clients from accessing certain menu items until they upgrade their subscription, or otherwise purchase an 'upgrade' or 'add-on' for their account (depending on your specific use-case).
Overview: https://help.themarketerstoolkit.com/article/126/overview-of-the-lockout-page-themes
