Recommended by ThriveThemes
https://wordpress.org/plugins/capability-manager-enhanced/
Users » Capabilities
- Add, Create, Delete - Users
- Edit Theme Options = should give menu management perms say to Editors
https://www.wpbeginner.com/beginners-guide/wordpress-user-roles-and-permissions/
Using Thrive Leads, you can create a user on 'lead form submission' who can now access your free course or lead magnet if course is set with role acess of 'subscriber'
Checkout this video
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https://wordpress.org/plugins/members/
capability-manager-enhanced - Manage Roles