A Default Sales Location is a Location that is assigned to all your new Sales Orders by default. If a new Sales Order is created (read more), the Location field on the SO will display the Default Sales Location.

You can edit the Location on each Sales Order manually if needed. 

The Default Sales Location is set to your "Main location" by default. To change a Default Sales Location:

1. Navigate to "Settings" -> "Locations".

2. Find the Default Sales Location field and change it to a preferred Location.