Kim, welcome!

You can set the first measure as a pick-up measure by right-clicking anywhere in the measure and then in the Pop-up Menu, go to Measure 1>Pick-up Measure. It will count as Measure 0, and the next measure will be Measure 1. By the way, not sure why you'd want to do this, but you can identify any number of measures at the beginning of a piece as pick-up measures, and they will all be numbered Measure 0. If you enter notes in a pick-up measure whose values equal less than a full measure, the measure will play without a break.

As far as systems, I find it easiest to ignore the measures-per-system setting and let Notion calculate it for me. I then use the same technique as above but I select Measure X>Force New System to force a system break.

By the way, I'd recommend posting these kinds of questions in the general discussion area. More people may be likely to see them there and offer help.

Michael

Thanks for your reply.
Sorry I didn't react until now. Thought I'd be notified when my topic was commented on.
Think I have activated notifications now....

How do you mean "general discussion area"?

You posted in the Feature Request section. If you post in the general Topics, area, you'll probably get more chance of people replying.