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Hey Carla. Try this:
In your GDP sheet, click on the Labels shelf and then change "Marks to Label" to "Highlighted".
Then in your Dashboard, add a Highlight Action where Target Highlighting -> Selected Fields only has "Year" ticked.
This makes all labels invisible in your dashboard until you click/highlight a point on one of the lines, and the action makes all points for the corresponding year get highlighted at once.
Hope this is useful.
Thank you, this was what I was looking for!