.sty file section markers

I am trying to use musescore 3 or 4 to edit the midi part of Yamaha style (.sty) files. I can view and edit the notation but I can not see the start of section markers. I remember having a software many years ago that did this but i can not remember its name. It could well have been a trial download.

Any help with this or suggestions of other. free, software would be mush appreciated