for some dashboards, but not others, the rename function doesn't change what I'm guessing is the original name I gave the dashboard, that appears when I open it.
The new name I provide appears in View all dashboards > Search and in the rename function, but not in the user view of the dashboard. Conversely, the apparent name of the dashboard that appears in the user view does not appear in View all dashboards > Search.
Dashboard name in View all dashboards
Dashboard appearance in user view
Dashboard rename function
