The controller mappings UI was pretty confusing to use until I learned about setting the filter to “Assigned” by watching a YouTube video. Otherwise you are looking at long list of unused settings. I suggest that this filter defaults to Assigned at least until you change it.
I don’t see how that makes any sense. I mainly go to the control settings to add an assignment so I’d want to at least see the unassigned key binds. The current default is right for me.