Infusion displays the price level whose code is alphabetically first in the list.
You can manipulate this to suit in the price level settings here: https://app.infusionbusinesssoftware.com/settings/product/pricelevels
Edit the code of the desired price level to be the first alphabetically and it will now display in your product list.
New customers will also default their price level to the first price level in the list.
Migrated Licenses
The Retail, Trade and Wholesale price levels often migration with their description as their code. Editing their codes to a numeric code is the easiest way to manage your price level to suit.