[Geoff Bacon]

Put two fingers on the screen and spread them for to zoom out (enlarges the picture)
If necessary, scroll to the desired area by dragging sideways
Apply the annotation to the zoomed image
pinch zoom to shrink

Just in case you don't know, you can set the Nudge Tool so that it is always displayed when you are editing text (saves switching to the selection arrow)

I use blue rather than black text - this shows me what has been changed so that I can update my master file on the pc (though I'm using chords rather than fingerings)

Geoff