Magento Commerce, 2.2.x
Guest Checkout

Your store can be configured to require shoppers to open an account before making a purchase. The default setting allows guests to make purchases, with an option to register for an account after they complete the checkout processThe process of gathering the payment and shipping information that is necessary to complete the purchase of items in the shopping cart. In the final step, the customer reviews and places the order..

Checkout as Guest

To change the guest checkout setting:

1. On the Admin sidebar, tap Stores. Then under Settings, choose Configuration.
2. In the panel on the left under Sales, choose Checkout.
3. Expand the Checkout Options section.
4. If necessary, clear the Use system value checkbox. Then, do the following:
a. If applicable, choose the store view where the configuration applies.
b. When prompted, tap OK to continue.
5. Set Allow Guest Checkout to your preference:
6. When complete, tap Save Config.