Subfolders are no longer created by default for new Markets
We've made a change to behaviour when creating single-country markets. Previously, when a single-country market was created, a language/country subfolder was created for that market at the same time.
Now, new single-country markets default to use the same URL structure as the primary market. You can choose to configure subfolders for each of your international markets as you desire.
Learn more about subfolders and international domains in the Shopify Help Center.