Can I configure the app to show only products with the same tag?

Yes, you can limit the random recommendations displayed for products from the same manual collection of the current product by going to the Recommendation tuning section:

Then enable random recommendations and filter by product tag:

Let's say, for example, that you are viewing a product page of a product with the tag Woman. The random recommendations displayed will only be products with the Woman tag.

Please note that if there are not enough products matching the selected criteria, the recommendations will be automatically completed using random recommendations.

Please note as well that app utility tags, such as Global recommendation, Hidden recommendation or Recommendations disabled, are not taken into account when generating random recommendations by tag.