To close a quick action panel, usually in response to completing or canceling the action, run $A.get("e.force:closeQuickAction").fire();.
/*quickAddController.js*/ ({ clickAdd: function(component, event, helper) { // Get the values from the form var n1 = component.find("num1").get("v.value"); var n2 = component.find("num2").get("v.value"); // Display the total in a "toast" status message var resultsToast = $A.get("e.force:showToast"); resultsToast.setParams({ "title": "Quick Add: " + n1 + " + " + n2, "message": "The total is: " + (n1 + n2) + "." }); resultsToast.fire(); // Close the action panel var dismissActionPanel = $A.get("e.force:closeQuickAction"); dismissActionPanel.fire(); } })