When you enable recommendations on a per-collection basis:
A set of default objects is created, including jobs you can schedule and pipelines you can configure to fetch the recommendation data.
Signals are enabled.
From the collection picker, select the collection for which you want to enable recommendations, if it is not selected already.
Navigate to Relevance > Recommendations.
The Enable Recommendations window appears, displaying the list of objects that will be created when you enable recommendations.
If recommendations are already enabled for this collection, then the Object Explorer appears, displaying the recommendations-related objects in this app.
Click Enable Recommendations.
It may take a few moments for Fusion to create the default objects.