It sound like you want to send 2 separate feeds to 2 additional monitors?
First, confirm that both monitors are set to extended and that you are seeing an image (desktop background). (vaata et arvutist oleks ekraani seaded laiendtatud ekraan)
Liigu seadetesse settings>Display>Fullscreen
Set “display 1” to 2, and “display 2” to 3 (Note that 1 is your own desktop)
Then close settings and press Fullcreen (see on VMix`i programmi üleval osas kahe akna vahel) at the tope of VMix. You can also pick what you want to send to those displays from the Fullscreen dropdown.