First of all, I apologize for resurrecting an old thread. The alternative was to create one with the same subject
I started following the instructions of the manual (same link provided by elminster) but did not succeed on:
Go to Preferences -> Look and Feel and enter the lookup name “#genre” into the “Categories with hierarchical items” box.
As in, I do not see that box
Any suggestion? By the way, I'm using 0.8.15...