Hi Jean,
I've just checked out the Android version, and there's possibly still something broken. Before Google broke it, you could set the Harmonic Chart to be displayed for the selected Radix in a dialog. This dialog no longer comes up, and PD just displays the 2nd Harmonic chart.
I'm using it on a Galaxy Note 9 in Android 10. (So, I'm praying, Lol)
Regards
Mavis