a:11:{s:4:"type";s:4:"text";s:12:"instructions";s:421:"Insert a nav menu.  Enter here only the theme location used to register the menu in /app/Controllers/App.php.

ie. in App.php if this is how you register the menu:

public function footerfirstmenu() {
      $args = array(
        'theme_location'    => 'footer_first_menu',
        'walker'            => new Appwp_bootstrap5_navwalker()
      );

The value you'd enter in this custom field is footer_first_menu";s:8:"required";i:0;s:17:"conditional_logic";i:0;s:7:"wrapper";a:3:{s:5:"width";s:0:"";s:5:"class";s:0:"";s:2:"id";s:0:"";}s:13:"default_value";s:0:"";s:11:"placeholder";s:17:"footer_first_menu";s:7:"prepend";s:0:"";s:6:"append";s:0:"";s:9:"maxlength";s:0:"";s:13:"parent_layout";s:20:"layout_61ba56a1c4ba1";}