We moved it to the chart settings.
On the top of your screen in song view, tap on the third button from the right, then Transposing instrument and select your key.
Yes, it's still possible but currently there is an issue with it.
Temporary solution: after you come back to the app, swipe up control center from the bottom of your screen and press play.
We will fix it soon.
As Dflat mentioned it, click on Preferences, set Chord Scales to bass clef.
Here are some screenshots:
After that, click on Chords at the bottom of the page, then Chord Scales.