Explanation:
Box 1: Associate the country/region to the store.
Associate countries and regions with online stores in Commerce headquarters Countries and regions are associated with online stores (also known as online channels) in Commerce headquarters. When you associate a country or region with an online store, you indicate that customers who reside in that country or region should view the site that is mapped to that online store. You can associate multiple countries and regions with an online store as you require.
To associate countries or regions with an online store, follow these steps.
* Go to Retail and Commerce > Channels > Online stores, or search for "online stores" in the search box.
* Open the online channel that you want to associate countries or regions with.
* On the Countries/Regions FastTab, select Add, and then, in the Country/region field, select the country or region.
* Repeat these steps for any other countries or regions that you want to associate with the online channel.
Box 2: Set up geo detection
The geo detection and redirection feature in Dynamics 365 Commerce lets you detect your customers' geographic locations and then use that information to recommend the site that is most appropriate for the country or region where each customer lives.
Reference: https://learn.microsoft.com/en-us/dynamics365/commerce/geo-detection-redirection