[scoot]

Is there anyway to stop Kodi from creating the grouping that is being created in the EPG?  E.g. Entertainment, News, Music, etc.
If I turn off "Synchronize channel groups with backend(s)" in PVR & Live TV I don't get a Sling TV group, the channels just appear in All Channels.

Yeah, in the default Estuary skin.
If you go to the EPG screen and scroll left as far as you can go to bring up the PVR sideblade menu options, you can change the view to not include the channel groups. Be careful though, because this option also includes changing the EPG view from horizonal rows to vertical. You just need to select the right view, ie horizonal without channel groups.
The Channel Groups will still exist on the side blade, but not on the EPG screen.
Not sure if this is what you were hoping for?

Not exactly what I was thinking but it does make it better.  I'm thinking I don't want certain groups to be even created to begin with.  This Sling add-on creates a bunch of it's own groups as I mentioned.  I don't want those but I want my other groups being created.  For example, I use Stremium, I want a Stremium group, and the Philo and Locast provider groups. I don't want the arbitrary ones Sling creates.  So I'm looking for something, presumably it would be a setting in the Sling add-on that disables those other groups from being created OR if there was a way I could permanently disable them in Kodi they would work too.