Hi Andy,
To only display a specific label you can use the following, in preExecution:
function() { this.chartDefinition.label_visible = function(scene) { return scene.getCategory() === "VisibleLabelCategoryValue"; }; }
To prevent that hovering bars makes then change opacity, you can do:
function() { this.chartDefinition.bar_ibits = 0; this.chartDefinition.bar_imask = "Hoverable"; }
Try it out!