In the left hand pane are a list of conversations. Each conversation contains one of more messages, which are displayed in the right hand pane. I am attempting to select multiple conversations (e.g., shift -> click or apple key -> click). I am also trying to use the delete key or apple -> delete to delete a single selected conversation (e.g., standard keyboard shortcuts). Neither of these operations appear to be supported. I would have sworn these were supported in earlier versions of this application.
Bottom line: How can I select and delete multiple conversations from the left hand pane?