I hadn't seen this before - items "related to your clicks" after I did a search, at the bottom of the page:
I last did this search a day or two ago, & did not see anything like this at the time. I just repeated some other searches I have done this month & none of them produced "related" listings, so either they have only been tracking clicks in this way extremely recently, or I didn't click on enough things in my other searches.
Note the listings are all from the same shop, although the listings changed & added more shops as I moved from page to page of the search. I am pretty sure I clicked on more than that first shop the last time I did this search. Also, some of those listings had sold before I did the search, at least one day before.
What are you seeing in your account? Please add to the comment section below or post in the thread on Etsy.