Add Measures dialog box

How to get there

CTRL-click the Measure tool .
Choose Edit > Add Measures.

What it does

This dialog box specifies how many new measures you want to add to the end of the score. When you add measures, the Width and Position Notes settings in the Measure Attributes dialog box for the last measure in the piece are copied into the newly added measures.

How many measures? Enter the number of new measures you want to add.
OK • Cancel. Click OK (or press ENTER) to confirm, or Cancel to discard, the changes you’ve made and return to the score.