lowflare, amendment to my last post, even with the box in front of you, the manual is useless.
As you appear to be already flying the 146, you must already have the basics worked out. As the basics are pretty much all it does, you needn't worry. Anything further is best learnt from further button pushing in cruise etc.
As far as I could see, the manual seemed to be there only as it was a probably a legal obligation to provide one, it certainly didn't seem to be there to provide any actual teaching value. And it didn't.
By the way, I wouldn't be so sure GNS-XLS is that much better - it also fairly regularly lapses into DR mode, freezes, has sensor miscompares etc etc.