Utilities/Check Notation/Convert Mirrors

The Convert Mirrors command affects Mirrors, or "intelligent copies" of certain measures, in which the copies are dynamically linked to the source music. It converts such measures into "real" measures - in effect, severing the link to the original source measures, and changing the selected mirror measures into normal non-mirrors. The "Converting the mirrors…" alert box appears, asking you if you're sure you want to convert them.