To enable guest access per website:
Navigate to System > Websites.
For the necessary website, hover over the More Options menu to the right of the necessary website, and click to start editing the configuration.
Select Commerce > Guests > Website Access in the menu on the left.
For faster navigation between the configuration menu sections, use Quick Search.
Clear the Use Organization checkbox to change the organization-wide setting.
Select the Enable Guest Access checkbox.
Click Save Settings.
To disable guest access globally, clear the Enable Guest Access checkbox.