Mono Sound when using DJM-900nxs as audio device

With the new update of Rekordbox 5.2.2 there is no longer a Left and Right channel association when using the DJM-900NXS Asio in the Output Deck under Audio preferences. I used to get stereo sound with the elder versions of Rekordbox where it rekordbox used to allow assigning USB 1 for Left, USB 2 for Right for Output Deck 1 and so on. However; with the new update rekordbox allows to choose a whole channel (ch1 or ch2, etc) to each output deck.

Help I need the sound from both Left and Right speakers. My DJM-900nxs firmware is up to date and so is the driver