Earlier I have just installed WP Travel and also purchased the WP Travel Utilities. As I am moving through settings and testing specific features I discovered that the first test trip page appears like it’s set up to show a widget area. The trip page you can find it right here: https://neptunedivingbali.com/itinerary/scuba-diving-in-padang-bai/
However, in the WordPress administration in Widgets there are zero widgets showing for WP Travel: Archive Sidebar and there are no other Widget areas available for WP travel.
Also, the theme I am using is The7 which has a customisation for pages for widget area positions or disabling widget areas but it does not appear for the Trip edit page.
Sidebars are shown by theme. WP Travel have registred a sidebar which has to be used in theme like on this theme https://wordpress.org/themes/travel-log/. Theme has used WP Travel sidebar so that user can display the widgets.
So you need to add sidebar in the theme.