add_filter('bricks/posts/query_vars', function($query_vars, $settings, $element_id) {
    // Replace 'my_element_id' with the ID of your Bricks element
    if ($element_id === 'my_element_id') {
        // Check if the 'data_sale-item' switch is set to 'on' or '1'
        $is_sale_item = isset($_GET['sale_item']) ? sanitize_text_field($_GET['sale_item']) : '';

        if ($is_sale_item === '1') {
            $query_vars['meta_query'][] = [
                'key'     => 'data_sale-item',
                'value'   => '1', // Assuming '1' indicates the switch is ON
                'compare' => '=',
            ];
        } elseif ($is_sale_item === '0') {
            $query_vars['meta_query'][] = [
                'key'     => 'data_sale-item',
                'value'   => '0', // Assuming '0' or empty indicates the switch is OFF
                'compare' => '=',
            ];
        }
    }
    return $query_vars;
}, 10, 3);