To untick the Category, go to View Visibility & Graphics Overrides, as I showed in the first Screenshot. To understand what colors are assigned to what Categories, go to Object Styles, as I showed in my second Screenshot.
...both under the Imported Categories Tab.
...if you continue to insert and use content created in AutoCAD and other third-party software, their Default Graphics Display (e,g, Color, Line Weight. Pattern, etc. ) will generally be listed under the Imported Categories Tab of Object Styles, and View Visibility and Graphics Overrides under Imported Categories Tab will be where you would go to override these defaults in a particular View - or turn them OFF entirely in the View . FWIW.