see UserManual Page 77 - close to the track mark (..1 - 2 - 3 ... ) should be a play paus button.
But this works only until you prepare your sets ore playlist. (if the button does not appear - switch off the RX)
The Workaround to "prelisten" a track is a one way road, as i can see you can only load the track in a free trackdeck.
i remember this feature from Native instruments Traktor and miss that sometimes on Serato 8-)