How do initially open different accordion panel other than this first?

I figured it out! In the main navigation menu, under appearance, I used the Custom Links navigation button (instead of the Pages navigation button), and entered a custom link like this:
https://domain.com/directory/page#item

It worked! Simple. But the problem with this method is that the target ID forces the page to scroll up to that accordion panel. I would prefer that the page stay at the top.

So I was originally thinking if something like the following could exist:
(1) In the container accordion this would be false: openfirst=false
(2) And then in the nested accordion: open=true.
How would the code be rewritten to do something like the above?

Adding the #id is really just a work around, not a solution.

There is currently no way to open an arbitrary accordion item beyond the workaround you outlined above. I have made a note and may include the ability in a future update.

Okay. Thank you!