Change ottava default settings for better readability
I've seen that the octava lines look very different from the ones in printed scores, and changing them individually is tiring. Among other things, the solid lines are confusing, since the pentagram has the same kind of lines.
First, the line shouldn't be solid, but dotted (or dashed).
Second, only some editors write "8va", most of them write only "8".
Third, if there are only numbers the font could be Mscore1 (Feta font), which would look better.
See the examples I've fould from many different editors of the past 150 years:
Also see my changes