There are two ways:

  1. Click "Mixer" in the right sidebar, click "PVM Audio monitor" button, yellow means on, gray means off.

           

  1. Click the "PVM monitor" button in the bottom status bar, the yellow means on, and the gray means off.

         

  1. In the PVM monitoring state, click the source window of the waiting area, and the source audio will be output to the desktop speaker.