You can set recommendations in various locations in Magento 2. Note the order of these settings: if you set something in the product settings, this setting will have a higher priority than the two other settings. These settings will overwrite the category and general settings. The category settings overwrite the general settings.
General settings
Stores > Configuration > Catalog > Tweakwise > Recommendations
Category settings
Catalog > Categories > [category] > Tweakwise
Product settings (crosss/upsell only)
Catalog > Products > [product] > Tweakwise