I first opened the ROLI Studio Player plugin inside Ableton Live and it asked if it should switch to single MIDI mode. I clicked yes and everything worked well.
Next I opened the plugin inside Steinberg Cubase and it's still stuck in single MIDI mode and I can't figure out how to go back to full MPE mode.
Can I switch the mode manually? Is there a way for it to remember which mode to use per DAW?
If you click the small musical note symbol in the bottom-right corner, you can configure the channel and MPE settings for ROLI Studio Player. Each configuration for each DAW should be recalled with any DAW sessions that you save.