DTS sound does not work on Samsung UHD TV (2018)

[Nadahar]

Last I checked, Dolby Digital and AC-3 was the same thing. That said, UMS should transcode to AC-3 pretty much with the default configuration. What you probably need to change is the renderer configuration for your TV, which probably states that DTS is supported since it is on previous models. If you remove this, UMS will know it will have to transcode, and will probably go for AC-3 by default.

[Nadahar]

You can't do it from the GUI - you must edit the renderer configuration file that is being used. Look for the "supported" lines, and remove DTS from every line where it is specified.

[Nadahar]

How did you "try" the 2019 config? Did you force default renderer and set it to the default?

With that config it should do what you want AFAICU, but without logs there's no telling what's actually happening.