After a detailed search, I have come to the understanding that the only page that works without problems in presenting tours is the: https://travelanddo.net/tour/
Instead, I have copied elements from the page https://travelanddo.net/tour-home/ and have created 3 different pages to showcase my tours for 2 reasons:
1. Because I need more detailed URLs for better SEO, describing the "where" and "what" of the tours.
2. Because not all tours are of the same kind to be all presented in just one page. For example in my case, I have multi-day tours ( https://travelanddo.net/small-group-travel-experiences-greece/ ), one-day tours ( https://travelanddo.net/day_trips_activities_greece/ ) and custom tours ( https://travelanddo.net/custom-vacations-retreats-greece/ ). And in the future, I will surely need to have even more different pages to showcase my tours.
Please, suggest how I could present my 3 above tour pages in a way that the internal algorithms you use in your theme about tour-search will be working. The way I have done it now it is not working properly for tours with different (repeated) dates.
I have installed the plugin "Duplicate post" that can clone every post or page. Should I use it to clone the https://travelanddo.net/tour-home/ page and then change URLs? Will then the search form work fine?