Hi and welcome
Each editor has its own settings, among which zoom.
Yes, this has something to do with it, but no matter which zoom I choose in either window, they drift apart.
How do I get them to align all the time ? (I want to move some of the midi events so they follow the audio )
I don’t think this is the right method.
I suggest you do this in the same window:
In the main project window enable Edit In Place on the MIDI track. This way you will be able to align your MIDI events to audio.
Neat! - Thank’s