Open the logbook app and create a new entry.
Scroll to the bottom of the new entry screen and you’ll see a “Show All” button. Tap on it and the button will change to “Customize”. Tap on it again and now two icons will appear for each of the entry fields. With the “eye” icon you can show and hide fields. With the other icon you can drag and drop each field to arrange their order.
To save your fabulous new order tap on “Customize” again.