Select the layer your cue notes are in from
View > Select Layer.
Choose Document > Show Active
Layer Only.
Click the Selection tool and select a region. See Selecting
music for some region-selecting shortcuts. You can select as little
as one note, or as much as an entire piece.
Indicate how small you want the cue notes to
be by typing a number into the number box. This number is expressed
as a percentage of normal-size notes, so “50%” would give you notes that
are half size; numbers between 50 and 75 generally produce good results.
Click OK (or press ENTER).
To restore the notes, repeat the process but set the note size
to 100%.