There is a book available on Amazon, which I just happened to receive a copy of for Christmas but really haven't had much of a chance to delve into.?
It is called the Radio Today Guide to the Xiegu X6100 by Andrew Barron, ZL3DW :
I have a few of his other books from the same series for the IC-705 and the FT-991A and they are both excellent so I am expecting the X6100 book to be equally as good.? The only issue with these books as they capture the functionality as a snapshot in time. As the firmware evolves the book becomes a little dated but the book is pretty recent as it has a June 2023 publishing date so it might be what you are looking for.?
Cheers
Michael VE3WMB?