Remove & hide WP Admin Access / Bar

functions.php

// Remove dashboard access for normal users
if (!current_user_can('manage_options')) {
    add_filter('show_admin_bar', '__return_false');
}

add_action('admin_init', function () {
    if (!current_user_can('manage_options') && $_SERVER['DOING_AJAX'] != '/wp-admin/admin-ajax.php') {
        wp_redirect(home_url()); exit;
    }
});