Thanks guys!

Raymb1: Pref-display & Song-setting/new line only affects the chord-sheet display I think. They work fine.

Lloyd: Fantastic! I just tried your work-around for a 54-bar song, and it works!

It's a hassle, and I could wish "Notation Options -> 'New Line each part marker' worked as it should, but I'm so grateful for your tip.

Rachael: Try Lloyd's trick. Put the no of bars you want per line, separated by commas, in Lead-sheet-Opt-Fakesheet bars/line, and see if you can make that work.

Thanks to All - Best - Andy