The HandsOn Connect 'Control Panel" tab is a tab that can be found in Salesforce Classic.  In lightning - you can access it by going to the App Chooser, and selecting it in the list of "All Items".   

The majority of the settings visible in the Control Panel are left over from HOC 2.0 functionality and no longer used by HandsOn Connect 3.0. These will eventually be cleaned up and removed but for the most part you can ignore these settings.

There are however a few settings in the Control Panel which are still used to configure things in HandsOn Connect 3.0. The control panel menu items and fields that are still relevant to HOC 3.0 are listed in this manual.  You should ignore all other control panel settings other than the ones mentioned in this manual.