My apple TV is set up correctly, as other apps like netflix play content with 5.1 audio. But nothing on Pik TV is more than 2 channels. I couldn't find any setting to change it. This really hurts the experience for movies.
Would also like to know if there is a way. Pretty sure it's just all the app does, which is pretty backwards for 2019 and as you mentioned makes it totally useless for watching movies or even high action tv shows.