I don't know if this is current, but it should be similar to these settings:
Your post sounds like you were trying to enable it for speakers.
Thank you! My DAC does work in USB mode on the PS5, and this XSX setting made DTS:X work immediately via HDMI and then optical from my TV to my DAC! Thanks for the tips, this is game changing.
Really regret my 7X purchase but I guess they can be a Christmas gift now :')