I have previously made a feature request for this under PM6, but being in the course of having PM6+ take over my full DAM from Lightroom, I am now considering this to be a bug which urgently needs to be fixed.
Keywords can be keywords, synonyms or categories. Categories, of course, do not export. On Mac systems, each is separately visible, bold or colour distinguishing synonyms and categories from plain text keywords - you can tell which is which at a glance.
But in Windows, there is absolutely no visual way of telling whether an entry in the Structured Keywords panel is a keyword or a category. All you can do is right click, to look at the options to which it may be changed, in order to identify whether an entry is a keyword or category: something that is of course hopelessly impractical for a large collection of structured keywords. My failure to notice that a particular keyword was in fact a category has recently caused me a lot of wasted time and work.
This is solved for Mac, why not for Windows? If PM6+ is to be used seriously as a standalone database for keywording and to replace Lightroom, this is an omission that urgently needs to be fixed for the Windows version.
Please tell us whether there are any plans to fix this, and if so, when? I hope that the answer is very soon.
Thank you for considering.
Graham