You have the Key Editor open. You have a note selected and that note is a few ticks ahead of beat 1 of the beginning the Event, say 220.127.116.11.
So you move it left a bit so that it’s just outside the beginning of the Event. Say 18.104.22.168
You now get the warning "Enlarge Part Or Move Anyway?’ You choose ‘Move Anyway’.
Now hold down the Q key to Iteratively Quantize the note. It -should- eventually quantize to the beginning of the bar, no? Although it -says- that it is at 22.214.171.124, the note will show as muted (ie. that it is outside the Event boundary).
It depends, if the MIDI Note out of the event is selected or not. If there is any selection, the Quantize function is applied to the selected notes (in general). If there is no selection inside the MIDI Part, then the MIDI Part is selected and the Quantize is applied to the (selected) MIDI Part. But then the note is out of the (selected) MIDI Part, so it’s not applied.