There’s nothing to worry about. The products will show up there soon.
The recommendation algorithm predicts the most relevant products based on the product a customer is interacting with. The criteria that the algorithm uses depends on the recommendation intent and a merchant's online store. In general, it might take into account the following factors:
- Purchase history - Finds products that have historically been purchased together.
- Product description - Finds products with similar descriptions.
- Related collections - Finds products from collections that the current product is part of, excluding collections with handles all and frontpage.
You can find out more details about this here.