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<?php
function example_group_open_wrap( $field_id, $data ) {
  if( $data['class'] == 'class1' ) {
    echo '<div class="my-fields-group">';
  }
}
add_action ( 'ninja_forms_display_before_field', 'example_group_open_wrap', 1, 2 );
 
function example_group_close_wrap( $field_id, $data ) {
  if( $data['class'] == 'class2' ) {
    echo '</div>';
  }
}
add_action ( 'ninja_forms_display_after_field', 'example_group_close_wrap', 1, 2 );