To move an item you have already created, you may follow these steps:
Click on the item pin in the Next Field app.
Click on the 3 dotted menu icon on the right hand side to access the options menu.
Click on 'Show item on drawing'.
To move an item, hold your finger on the item pin for a couple of seconds, then drag the item pin to the new position.
When you release the item pin with your finger, the new position will be saved automatically.
Please note that an item must be 'Open' or 'Delegated' in order for you to be able to move it.
Please see the screenshots below: