In this article, I explain about to assign the best selling product in-store navigation.
Please follow the below steps :-
Step : 1
Check your default collection name in App Settings

Step : 2
Go your Online Store > Navigation and select Main Menu

Step : 3
Click on Add menu Item

Step : 4
Enter Menu Name in Name option

Step : 5
Select Collection option in link option

Step : 6
Select your Default Best Selling Collection in the collections list

Step : 7
Click on Add button

Step : 8
Click on Save Menu button to apply changes

Note:- Collection may be different according to your collection name.
Now your best selling navigation ready.