I guess not many people read the PDF book but I use it more frequently than the online version since it’s convenient to annotate & add notes.
The current releases don’t have the full bookmark, as in this screenshot.
Previous versions (2.5.3) for example, have the full bookmark:
I had a look into to the docs repo and it seemed the folder structure, build scripts were changed after 2.5.3. Probably the new versions have new release .
I’ll try to build the docs for 2.6.3 using the old style.