How to use HA Customization config interface to set homebridge_hidden: false

Hi.
I am using the HA UI to set customizations, but I can’t figure out how to set

homebridge_visible: true

or

homebridge_hidden: false

so that my devices show up in HomeKit.
(I’ve changed my homebridge config.json so devices are hidden by default, since there were too many of them.)

Thedocs for homebridge-homeassistant say to use the first option (homebridge_visible) but it’s not in the customize UI drop-down.

When I use the UI and choose the second one (homebridge_hidden), I get a checkbox that I want to set to false (not ticked), but when I click save, I see:

The following attributes weren’t set. Set them if you like.

and the setting is ignored.

I tried editing the customize.yaml file directly (with both options), but then the UI says:

It seems that your configuration.yaml doesn’t properly include customize.yaml
Changes made here won’t affect your configuration.

How am I supposed to achieve this (and can some docs be changed to show others)?
Thanks!

I’d still like to get an answer here.
It seems obvious that there’s a problem with the documentation.
It would also be nice if it were possible to set the homebridge_hidden value to false with the UI, but this doesn’t seem possible at the moment.

For now, I have achieved my desired result by setting everything to visible in the homebridge config file, then using the HA config code to hide all of the automations and groups, which were the bulk of the ones I wanted to hide.

  customize_domain:
    automation:
      homebridge_hidden: true
      hidden: true
    group:
      homebridge_hidden: true