Thanks Peng for your quick response.
I have checked as your response:
1. + 2. :
I have more than 900 products imported into catalog of Rec.AI, in which more than 700 products with availability="IN_STOCK".
I have counted user events in 5 recently days (from July 03 to July 08). There are nearly 90% products shown in these events.
And I inputed these events as "detail-page-view" events into Rec.AI
3. I use console UI to get recommendation list as below picture, so I don't think the list is affected by tag filtering:
I really dont understand why the list is shortened when there are scores also returned in it, and users can cut off according the list as the need based on these scores
Thanks & Regards.