How to disable "Category Sets" panel permanently?

[TR0N1C]

I like to run multiple instances of XN MP, and when I do so every instance except the first will default to having the "category sets" panel open. When I go to view>panels>category sets and uncheck that option, it will turn back on after I view a picture in fullscreen, when I double click out and back to browser view, BAM there it is again, turned back on.

I've searched quite a bit and found nothing similar at all, it seems most people want to use categories, I don't want to use them at all. I've tried setting the options to my liking with only one instance open, closing and then trying again to no avail...

So what I'm trying to achieve is, run multiple instances of XN MP, switch from browser to fullscreen and back again, without the "category sets" panel popping up in the bottom right corner during browser view.
Any help is much appreciated.
Thanks in advance.
Cheers

[xnview]

if you close the category panel, quit XnView, you will not have it at next startup