Well. It’s more about what you’re supposed to hear. Actually you won’t see much in that paradigm…
(You could use the “show writing auto” option though)
Anyway, once on W mode :
- select a cue
- make the range on that cue (“p” by default)
- hit preview
- hit loop (fill mode)
- do what you have to (you can use preview suspend for comparison)
- hit punch when you’re done
- beer time (or next cue), no need to see actual auto lines…
Of course, this is just one particular way to use preview, and it might not address exactly what you’re trying to accomplish (if you absolutely need to move break points by hand really precisely, for instance)
Hope this helps.