Power BI User on 10 Feb 2020 17:43:22
Currently, there is an option "Require single select" on every filter card.
However, the user can still select the "Clear filter" icon to clear all slicers
What's needed is a real single select option similar to the one currently present in slicers, where it switches to a radio button mode, and one option must always be selected (i.e., user cannot unselect all the options