You can specify Favorite channels for given networks, but there's no way to navigate them by network. All channels are mashed together without a dropdown menu or folderization.

I would also recommend making this dialog twice or 3 times as wide to display longer channel names and descriptions. I could add the network name to the description if nothing else.

I am willing to help curate your default Favorites list, if you're interested in free work.

Well. At least I won lunch.
Good philosophy, see good in bad, I like!