This feature is available from app version 3.2.7 (which is currently in beta testings)
You can reorder lines and parts with the drag and drop feature
▶️ Reorder a part (Chorus, Verse, etc)
Long-press on the label of the part (Chorus, Verse, Bridge, etc). Wait until the part is highlighted, then drag the part to a new position and lift your finger.
Drag & drop entire part
▶️ Reorder a single line
Long-press on the end of the line, where the line repetition is displayed. Wait until the line is highlighted, then drag the line to a new position and lift your finger.