Frontend submission lis: tIs it possible to list the posts from all users?

Hello there,

Yes, it is possible. The posts in the frontend dashboard are retrieved by a WP Query, and there is a filter hook rwmb_frontend_dashboard_query_args that supports modifying the arguments. Please read more on the documentation https://docs.metabox.io/extensions/mb-frontend-submission/#dashboard-hooks

Here is an example code:

add_filter( 'rwmb_frontend_dashboard_query_args', function( $args ) {
    // Get the user role
    $current_user_id = get_current_user_id();
    $user_meta = get_userdata( $current_user_id );
    $user_roles = $user_meta->roles;

    // Check if the user has an editor role, remove the argument author
    // see here https://developer.wordpress.org/reference/classes/wp_query/#author-parameters
    if( in_array( 'editor', $user_roles, true ) ) {
        unset( $args['author'] );
    }

    return $args;
} );