message: fix(explore): dnd multiple columns doesn't work
diff: @@ -161,7 +161,7 @@ export const DndMetricSelect = (props: any) => {
  };
  const onNewMetric = (newMetric: Metric) => {
  - const newValue = props.isMulti ? [...value, newMetric] : [newMetric];
  + const newValue = props.multi ? [...value, newMetric] : [newMetric];
  setValue(newValue);
  handleChange(newValue);
  };
  