My mission planner has no “Set Mount” button,why?

Ground Control Software Mission Planner
1

I can’t find “Set Mount” button, Mission planner version is 1.3.80
In Flight data page, the buttons is : “Quick”, “Actions”, “Messages”, “PreFlight”, “Gauges” , “Drone ID”, “Status”, “Servo/Relay”, “Scripts”, “Telemetry Logs”, “DataFlash Logs”