I select the first element to create the loop, but Octoparse does not automatically recognize other similar elements. How can make it select all?
When Octoparse does not recognize similar elements, you can continue to select other elements which are not selected to help Octoparse find all elements.
You can check the below example(https://www.homeaway.ca/search/keywords:canada?adultsCount=1&petIncluded=false&infantsCount=0&ssr=true)
When we select the first title, only 3 similar elements are found.
We can continue to select the 4th title and you will see Octoparse finds more elements.
If after clicking several elements, Octoparse still cannot locate all the elements, you can create the loop item with the selected elements first, and then modify the XPath of the loop item to locate all the elements.
To know how to modify XPath, you check the below tutorials: