This thread is on the "Mastering Emacs" book and from its author, on the topic of mastering Emacs window managements you can read this:

https://www.masteringemacs.org/article/demystifying-emacs-wi...

To be honest I've never played with this part of Emacs. The way I use it I'm fine with the default. But if not it's possible to take control of Emacs internal windows management.