Where have you looked? Try Settings/System/roomname (where roomname is the room with the Arc) and scroll down to Trueplay. 

Yep, all I get is wifi on/off (if I press products/Arc)

Under the Roomname there is no trueplay option either.

Have you scrolled down in <roomname>? Trueplay is in the Sound section. You’ve gone down one level too far if you get to wifi on/off. 

I only have EQ & Volume Limit under the sound section.

Done it on my Iphone SE.

I noticed in roomname it had arc +? (should be Sub)

Pushed button on sub & checked app & up popped “do you want to tune”.

Now shows sub & trueplay option.

Strange that a Sub issue prevented Trueplay from initialising.

Thanks nik.

Glad it’s sorted. Now: enjoy!!!