It would be nice if you could filter the “Cards View” widget on dashboards to only include the items from one specific board rather than all of the boards items.
You can, by using the filter. It’s clunky, but if you go into the filters on the widget, then advanced filters, you can filter out all the groups from all the boards you don’t want to see. It takes a bit to get it done.
For every other widget the filter gets saved. I have some kind of bug where on the card filter it resets after some time. But in theory, it should work.