The Recommendation Settings feature includes options that are applied globally to all recommendations. It's important to note that these options might override configuration settings specific to individual recommendations, so caution should be exercised when making changes.
Recommendation Visibility controls the overall global visibility of recommendations. To activate any recommendation, Recommendation Visibility needs to be enabled. However, it doesn't override the visibility settings of individual recommendations, as each recommendation needs to be enabled separately.
Filter Duplicate Products is an option to remove instances where the same product appears more than once on a single page (load). For example, if multiple recommendations are positioned on a product detail page, this option will eliminate potential duplicates that may be shown in different recommendations on the same page.
Exclude Purchased Products is an option to remove products that have been previously purchased by the same shopper.