Applicable to: iOS, Android
To create a draft:
From the Orders tab, start a new order by creating one from scratch or by repeating a past order.
Once you are at the page where you review your order, simply press the Back button on the top left corner of the page (iOS/Android) or press the Back button at the bottom of your device (Android).
This action will save your order as draft and it is now listed in the Orders tab.