This plugin allows you to hide the pesky reiterations of clefs that occur at section barlines when appending scores.
Append Scores is a phenomenal feature of Sibelius, but there is a bunch of clean-up required to get to those publisher quality scores. This powerful single-purpose plugin has been time tested and user approved. Originally written for Sibelius beginners, it is easy to use but still comprehensive. Another utility to run when touching up those big scores.