Yes, itās definitely Note Expression. For my own benefit - to confirm to myself and to learn something about note expression - I recreated the image by creating arpeggios with sustains and then I ran Midi->NoteExpression->ConvertToNoteExpression on the midi part and it is the same. So, as explanation, see my image below.
Ring 1 - The ShowNoteExpressionData button - show and hide
Ring 2 - In fact the Sustain events are converted into note Release Lengths (and the sustain data isnāt deleted, whereas it is for other controllers)
Ring 3 - I reduced the Release Length on this selected midi note - you can remove the āsustainā tail entirely by setting this to zero
Two ways to answer the OPās question:
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Select all notes and then change Release Length to Zero (double-click in release length so you have all text selected then type 0 and press Ctrl-Enter to set all values absolutely zero (rather than relatively, which is what happens if you donāt press Ctrl))
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Hide the Note Expression Data using the show/hide button.
Mike.