Hi!
Thank you for taking the time and creating this feature request.
That is a great idea and fits to the plugin’s profile, so it should be implemented. But at this moment, the plugin does not integrate with WordPress multisites on Network-admin level. For now, every sub-site holds individual settings. So in this case, a vendor using sub-site could hide the widget for the network admin.
If we pick more options like this, that could be useful for network admin to manage whole network, I could introduce an integration on the network-admin level. Or maybe even a switcher to select if users can or cannot manage individual settings on sub-site level.
That’s definitely worth thinking about. I also hope that the Woo team will add the requested option soon. Judging by the tags updated on your GitHub issue, it may come quite quickly. For now, I will mark this thread as resolved.