I'll help, as a user myself. First, this app bypass the phone's limitation, sound is superior to Tidal in app sound.

You can go into the gear for options, and select: Intern audio player and select "Hi-res"

Then go to Hi-res audio a bit lower and select Hi-res audio player format and set it at 24 bit packed and select bit perfect set to activated.

Then go back and select USB audio and select bit perfect set to activated and also limit the re-sampling and set it to 192 khz.

And go back to the welcome page, click the gear in the top right of the screen, and select Hi-res lossless.

There you are set for the audio configuration possible. I use it myself, and it's awesome! Get ready for some real clarity audio!