« Reply #2 on: April 22, 2016, 02:29:31 PM »
This is a Sibelius feature. See House Style > Engraving Rules > Bar Rests. Under the section for "Repeat Bars", you can select how often 1-bar repeats get numbered (sounds like you're looking for "every 1 bar".
I have Sibelius 6, so getting to the correct option may be slightly different in other versions, but I'm sure it's there.