Headless vs. storefront, different storefronts with different assortments, but one shared admin
On the left in the menu of your Shopware Administration, you can see your Sales Channels and make changes or add a new Sales Channel.
Taken from this article
Sales Channel for Pickware POS
When you install Pickware POS, an additional Sales Channel is automatically created for you. You'll find it on the left in the menu. When you click on it, you'll get to the settings for this Sales Channel.
For your store, the following settings are particularly relevant:
Name – This is the internal name for your Sales Channel.
(Default) payment and shipping methods – Here you can specify which (default) payment and shipping methods should be available in your store.
Default currency – Here you specify which currency should be the default currency for your Sales Channel.
Tax calculation – Specify whether tax calculation should be done horizontally by row or vertically by column.
You'll find more information on these and other settings in the Shopware documentation.