To delete a draft of a Journey:
Navigate to the Journeys page by clicking on the Journeys option in the left-hand menu
Find the draft you wish to delete on the table, in its row, click the three-dot menu at the far right column of the table.
From the menu select “Delete”
You'll receive a popup to confirm that you'd like to delete this journey. Select "Delete"
Deleting Journeys that are already published is not recommended.