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Fastest way: In the Measures pane (NOT on the viz or dashboard) CTRL-LEFT CLICK (Option-Click on Mac, I think) to select all the measures you want to change. Right-click on that selection and select Default Properties, Number Format. You can change them all at once.
You could also pivot your source data so that all your measures are in one column, then format that one column the way you want. But that will break any vizzes built with the measures as separate columns.