I did a quick search for “triple barline”, but I missed that old topic, cause it comes out a bit lower in the search result. Thanks for the link.
I’ve understood that triple barline feature was born as a secret thing.
However, the current Dorico manual doesn’t mention that this barline is a secret one, and it is introduced as one of the types of barlines we can input normally. The manual sez
" Types of barlines
There are multiple types of barlines in Dorico Pro, which can all be input, moved, and deleted in the same ways."
Considering from this explanation in the manual, shouldn’t the triple barline option also be in the right panel?
It would be a nice feature! (Even if there is a workaround using the dashed barline with dash length 0.)