Project-wide engraving options for brackets and braces
You can find options for the project-wide appearance of brackets and braces on the Brackets and Braces page in Engraving Options.
The options on the Brackets and Braces page allow you to change the design of brackets, such as by hiding or showing wings on bracket ends, and the gaps between brackets, braces, sub-brackets, and sub-sub-brackets and other items, such as systemic barlines. You can also set span thresholds for when you want Dorico Pro to use the different available brace designs, including preventing Dorico Pro ever showing flat braces.
The options are accompanied by diagrams to help you visualize how they affect the appearance of your music.