Thank you for reporting this.
Are you still experiencing this problem? If so, are you using a plugin to create/manage roles and capabilities?
The “Content Aware” menu item should only be visible for users with the edit_theme_options
capability.
The “Sidebars – Quick Select” metabox will be visible for anyone that can edit posts/pages, ie. it is intentional that they should be able to select an already created sidebar/widget area to be displayed for their content. Only users with edit_theme_options
capability can create new sidebars from here.
If you want to hide the metabox for users without a certain capability, you can add a filter like this:
add_filter('cas/module/quick_select', function($enable, $post_type) {
return current_user_can('edit_theme_options');
}, 10, 2);