Composer supports a variety of ways indicating that a section should be repeated, or that the performance should continue at another place in the score:
Composer automatically plays any repeat marks and endings as displayed in the score, unless you disable them with the Ignore Repeats and Endings command.
Composer does not automatically interpret "go to" performance marks such as "D.S." (Dal Segno) or "D.C." (Da Capo). However, you can instruct Composer exactly how to play such "go to" marks using the Repeat Instructions command in the Measure and Barline Menus.