> In the meantime, is there a command that will close all drawers, even those
> that are open in sections (headings) that are closed? I searched but
> didn't find anything.

org-hide-drawer-all

I don't seem to have that command. I'm using Org mode release_9.6.10-835-gf3de4c.

I grep for org-hide-drawer-all there is the following entry that seems to imply the command is obsolete:

(define-obsolete-function-alias 'org-hide-drawer-all
'org-fold-hide-drawer-all "9.6")

If I try to run the command using

M-x org-hide-drawer-all

I'm told "no match".