How to turn on Personalization on Collection Groups
Open the search configuration.
Click Add Group button, to add a new collection group/choose existing collection group.
Click Add Collection button to add the collection pages.
Click Edit Merchandising button to update merchandising on the collection pages.
Click on Add Sorting/Edit Sorting, to create a new sorting/edit existing sorting.
In the Best Matches tab, click on Add Best Matches, and select Relevancy/Personalization Score.
Click on the Personalization toggle button so that its activated.
Note, if you have multiple sorting options, please drag Relevancy/Personalization Score to the appropriate position.
Example- if you want to Bury Products on Sale, then it will be on the top followed by Relevancy/Personalization Score. This will ensure that personalization is applied after pushing down products on sale.
Note, Personalization is applied only on Best Matches sorting options.