1. About Header Widget option, it’s our theme feature that occurs on all widget area except on footer widget area. Header Widget option will override default style for general header widget element. For more detail please check out this image https://www.dropbox.com/s/vrcfmzvjo4i6aug/Screenshot%202017-11-10%2009.05.07.png?dl=0
I’m not quite sure what kind of issue that you mention in the screenshot. It seems that option comes from another plugin, right?
About JNews Essential plugin, we will recommend you to keep activate these plugin which is the mandatory plugin for JNews. Some feature maybe disable when you’re not activating these plugin.