1. Start by modifying the Paragraph Style for bar numbers. Check you are using the style for the score, and not for the parts.
  2. Then use Layout Options to position the bar numbers in the score layout.
  3. You can choose the frequency of bar numbers, whether to show them in the centre of the bar, and you can also display them in an enclosure, such as a circle or rectangle.
  4. You can choose to display bar numbers at the top and/or bottom of the system, but also above any instrument.