0<script type="text/javascript">
ExecuteOrDelayUntilScriptLoaded(IncreaseSurfacePivotCount, 'clienttemplates.js');
function IncreaseSurfacePivotCount() {
ClientPivotControl.prototype.SurfacedPivotCount = 4;
};
</script>
add this to script editor in the page where the list/library view is there.
