I'm not sure exactly why the sumo card filtering doesn't work EXACTLY like the kpi cards filtering. At a minimum, you should be able to check/uncheck all in a list.
Thanks for this feedback. I will look into this suggestion for Sumo filtering.
Just recieved the same question: Why can't i change my filters on my Sumo card. The values of the filters are not showing up when editing it. This is currently in 'Under Review' was curious if I'm doing something wrong or is this a bug/enhancement.