So basically this is not a DSD+ issue, but the fact that your headphones are plugged into the PC, and so the Realtek audio chip has sensed that because it has "jack plug in auto-sense", and has thus disabled your speakers.
Open up the Realtek control panel, and tell it to separate the audio output so that you wind up with separate headphones and speaker outputs.
Open up the Realtek control panel, and tell it to separate the audio output so that you wind up with separate headphones and speaker outputs.