The number of source of frustration and confusion amongst our users, when building Dashboards, is conflicts/inconsistencies between Dashboard and Widget filters. I have separately suggested that Sisense introduce a visual indicator of widget-level filters and it sounds like that is planned for the future, which is great.
Another related feature that a user suggested was a "reset all widget filters" button which would be a single place at the Dashboard level. If the user clicks it, it forces all Widget filters to (a) be deleted (or maybe disabled?), and (b) puts the widget filter settings back in-sync with the dashboard (meaning if the user has selectively toggled off Dashboard filter inheritance at the widget level, that will revert back to the defaults).
This is a really quick and easy method to put users back to square one if they have painted themselves into a corner, so to speak.