How can I access DOM elements of Support using a V2 app?
In Apps Framework V2 apps are hosted in sandboxed iframes. As a result, it is not possible to manipulate or add listeners to DOM elements of Support via a V2 app.
To interact with DOM elements via an App, a property or action would need to exist in our Apps V2 APIs. For example, for hiding general ticket fields, we offer this a method in our ZAF Support API: https://developer.zendesk.com/apps/docs/apps-v2/support_api#ticketfield.hide