Section Flow is the order the sections are displayed: verse, chorus, verse, bridge, chorus. You can set that order without repeating sections in the song text.
Write each section once in the song text, using a ChordPro section or a heading line such as Chorus 1:. Then open Edit Song and tap Section Flow. Add the sections in the order you will sing them.
The flow can be shown with the other metadata above the lyrics. Include Flow in the metadata layout or the app bar layout when you want it on screen.