To change the font for the numbers that appear
in a repeat bracket (for example, the “2.” in a second ending bracket), Choose Text > Ending repeat, and then click Set Font. See Document
Options-Fonts for more details.
To change the height of any brackets in your
score, choose the Repeats > Repeat Endings.
Change the Height of Bracket number. The units are whatever you’ve
selected in the Document menu for Measurement Units. See Document
Options-Repeats.