I assume you mean the chord line above the staff. Try this : 1- Staves>Chord Display + choose the staff 2- in the "chord display" edit window, choose the number of chords per bar (it can be a number, or one for each bar, one for each note, etc.) I'd suggest you use "each note", which is more versatile. As for the slash sign, you must actually use the backslash (on a PC, it's AltGr+the "_" key, but I don't know what it's like on MacOS and a QWERTY keyboard)
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Harmony Assistant - Ubuntu + Wine et Windows XP sur machine virtuelle. VS, OMeR, PDF2M