Thanks for your answer.
I was watching the "2. An Overview of Absynth" free video.
Yes I clicked on it.
I've heard that in newer versions of Absynth the "Genre" tab is no longer available.
I'm currently running version 5.1.0.
Interesting... I'm running 5.0.3 (slow updater me!)
... and the release notes for latest build of Absynth mention a new preset format and sound browser. That could be why the "Genre" tab has gone...