Here is my suggestion (or, what I am doing right now):
Give every author a container. If you are reading a number of books from the same author, still, separate the Titles of the books in the Author container with another container.
Separate the chapters of the books with a Separator.
So, when you are reading Book1 of Woody Allan, you open the Container Book1 in a tab. The sb will open until you finish that book. You work on that book; as deep as you want; draw diagrams b/N ideas, chapters, etc....
If the chapters are very complex and will be spending weeks on them, you might open a container to them too.
Here is my note:

Right now, I am reading Hicks Chapter 2: so, here is how it looks in the Map view.

Indeed, the strategy is all up to you. And, you see that I am not consistent with my Containers and Separators. I sometimes put the chapters as Containers, sometimes as Separators. If you see a book with separators, that means, I have finished the book; I have flattened it from a Container to a Separator. Most of the books had a lot of containers in them when I were reading them. When I finish reading them, I flatten the containers to compare ideas in each of the chapters in one map (you can also use agents for this purpose; but, this is just me).
1. The ability Zoom in: that is, I want to be deep into the content; focus on the chapter I am reading now. In Xmind, they call this property
Digin. You Digin into it. I use the Tab and the Containers to Digin into the chapter. In this first stage, the Containers are very useful. They are the curtains to block all the distraction around.
2. Ability co compare and contrast., so that I will not be lost in the details. You have to do this task after you finish the digging in process.
The compare and contrasting of the idea is done by: using agents; and, by removing Containers after you finished reading the chapters--flattening them into Separators.
A sidenote
as you would expect from the structure, my notes are big ones. I don't write a separate note for every quotation. Since I read hundreds of books and articles, putting out every quote or paragraph as a separate $Note would give me many thousands of notes which will grow unmanageable. And, for people who want to elevate every paragraph as a separate $note, I would recommend you to use Sente as a reading tool; it has such a system. I have that system for a long time. You can then import those small notes into TB.
For me, I had too many notes to manage; I dropped the system. I am now writing longer notes in TB. Exploding the long notes is also a possibility; I don't find that very useful though. The beautify of the small notes in Sente was on the $Title, anyways; I used to summarize the core points of the paragraphs on the $Titles. Sente is also probably disappearing, unfortunately.Of course, the strategies are always personal choices. This is just to give you a little frame to work on (if you are just beginning); which is better than a blank statement of "all your choice.