When applying price changes to markets in NA Bulk Price Editor, you can select the “Also change product prices directly” option.
By selecting this option, you can apply price changes to the root product prices that exist in Shopify (as opposed to fixed prices that apply to a Shopify market specifically)
The direct product prices are the same prices that you can change from the product edit page in the Shopify admin dashboard
The direct prices are the prices which the app would change if you left the “Select Shopify markets to apply price changes to” checkbox unchecked.
One important detail is that there is a difference between the direct prices and the fixed prices that are applied to the primary market.