The ‘null’ as the callback is supposed to make the top level menu item do nothing. You can’t! That link will always lead somewhere and that cannot be avoided ( and would make no sense and have accessibility issues if you somehow achieved it anyway ). Instead create a menu page and a submenu page … Read more
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Yes, WordPress does have plugins that allow you to create a custom admin page or dashboard with limited access — so that users (like other admins or staff) can access only selected features, not the full admin panel. Recommended Plugins for Custom Admin Pages / Access Control Adminimize (Free) User Role Editor (Free + Pro) … Read more
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