DTS passthrough

Hm i got plex pass now and updated to .9.8.0 but i still cant find the option i just find:

"Enable Media Link down-mixing of DTS audio.
Media Link does not support DTS audio in certain regions. The Plex Media Server can automatically convert DTS to stereo so that it will play."
 
But this does not seem to be the right one.
Can you tell me where exactly to find the option to convert DTS to AC3 for PlexConnect?

click show advanced settings.