WP Travel plugin provides the feature of collecting information of multiple travelers in checkout page during booking of trip.
To add multiple travelers form in checkout page so that information of multiple travelers can be collected, you have to enable ‘Enable multiple travelers‘ option by going to Admin Panel > WP Travel > Settings > Trip.
You can enable the option as mentioned above if you want multiple travelers form in checkout page so that you will be able to collect the information of multiple travelers.
Also, you can disable the option if you want to display just lead traveler form and want to hide the multiple travelers form in checkout page.
For detail assistance, you can refer below given screen record.
If you have any confusion then please post them in our official support forum.