Where are the secret Dock settings in OS 8?

[danirabbit]

In OS 7.1 and before you could access a hidden dock options window with lots of extras that aren't available in System Settings. How can I access these features in OS 8?

[danirabbit]

This doesn't work in OS 8. Please only provide answers that you've actually researched and tested :)

[danirabbit]

All of the options available for the new Dock in OS 8 are available from System Settings. The hidden extra options that were available in Plank aren’t supported by the new Dock which was written specifically for elementary OS and the secure session.

Can you add the feature that I'm missing to the new dock?
If you relied on one of these hidden options, please use the Feedback app to let us know so we can consider this feature in future updates!

Can I theme the new dock?
If you want to theme the new Dock, you can now do that by adding custom CSS to a CSS overrides file at ~/.config/gtk-4.0/gtk.css. There's a great community project here with some example themes: https://github.com/teamcons/eOSdock-themeswitcher

Can I still use Plank instead?
You can still install Plank (or another dock program) via Terminal and use it instead of the new Dock, but it will only work in the Classic Session. Alternative docks will not work in the Secure Session.