If you are using Classic/SimpleXML dashboards, you can do this with CSS.
For this you need to give your panel an id (so it gets tagged so CSS can select it), then you need to know the order of the series in the charts and they are numbered. For example, if you name your panel "panel_one", and your Total was the second series (index 1), you could do something like this
<panel id="panel_one">
<html depends="$alwaysHide$">
<style>
#panel_one svg g.highcharts-data-labels.highcharts-series-1
{
display: none !important;
}
</style>
</html>
<chart>
