That feature has been removed from the dashboard, and is now available from within the flow editor, see this demo - ✨ FlexDash alpha release - round 3 - #56 by tve which is a great improvement.
It was added in v0.4.142 and described in the same topic as the above - ✨ FlexDash alpha release - round 3 - #69 by tve
You may wish to bookmark the current forum flexdash release topic, to keep up to date with developments - ✨ FlexDash alpha release - round 3
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