I discovered the optional “break beams” which allows me to clearly write vocal parts with different syllabs. As for now, I could not find another way to achieve this than right click on each note and apply the break beam option. Is there a shortcut ? Is it possible that this option could be integrated in the software — each time a vocal part has different lyrics on different notes, the beams could automatically break ? This would save me time AND mistakes !
Thanks Daniel for your patience
 For those who find this thread with advanced search, it is absolutely possible to marquee select a whole bunch of music and untie beams with right click. It saves me A LOT of time