Apple Logic Pro 9 - Manual (Page 929)

To display higher frets in the chord grid view
µ
Click 1st to open a pop-up menu, then choose another fret number.
Creating, Editing, and Deleting Fingering Dots
You can create, edit, and delete fingering dots on a chord grid.
To create a fingering dot
µ
Click the string and fret.
A black dot is created.
929 Chapter 31 Working with Notation