Where do I find Package Manager of SetupHelper?

This seems like a dumb question, but whilst I can find numerous mentions of Package Manager, I’m not finding something saying where it should actually appear.

Posting in Modifications as this is referring to Kevin Windrem’s addons.

At the moment I just want a nice reboot button for a clean reboot (why isn’t that standard?)

So I looked at GitHub - kwindrem/ShutdownMonitor which said I needed GitHub - kwindrem/SetupHelper: Helper functions to simplify writing setup scripts that modify VenusOs functionality. The package includes automatic reinstallation of the package after a VenusOs update. first. (I was familiar with this from having installed it on a Pi initially, but now I have a Cerbo GX so need to do things again).

I did:
wget -qO - https://github.com/kwindrem/SetupHelper/archive/latest.tar.gz | tar -xzf - -C /data
mv -f /data/SetupHelper-latest /data/SetupHelper
/data/SetupHelper/setup
(as I have ssh access set up)
(and selected ‘i’ for install, and the option to restart the gui)

It was painless (Full marks to Mr Windrem), and a ‘Reboot Now’ button appeared under general, which works as expected. So initial issue solved (and rebooting the GX fixed my actual issue of timed charging only operating at a very small and fluctuating power level - not sure what that was about).

However the docs imply that I should have some ‘Package Manager’ functionality available to install/remove other things (and itself). What I don’t know is how to access this. I assumed there would be a menu item at the top level or under ‘General’ or something (I remember seeing a pic for this, but maybe it only works under the old GUI), but I’m not seeing one. And perhaps it’s only a CLI interface? The docs seem to assume you already know.
If someone could give me a clue that would be appreciated.

Package manager menus are under Settings but NOT in the New UI. Only I Athe Classic UI

Aha. OK. Found it. Under http://venus.local/gui-v1/ settings.

The reboot button IS standard in both the Classic and New UI under Settings / General.

ShutdownMonitor adds a Shutdown button in the Classic UI only in that same menu.

OK. I had misunderstood. Thanks. This makes sense, because I only installed SetupHelper, not ShutdownMonitor, and still had the reboot button. Clearly I hadn’t noticed it before trying the install.

OK. And Shutdown only really makes sense on the Pi because a Cerbo will just restart itself due to the watchdog anyway (AIUI).