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Display Trill Fingers Checkbox
The Display Trill Fingers Checkbox allows you to turn on and off the display of red trill fingering indicators. The default is checked (on). Click it to toggle from checked to unchecked.

(this can also be accomplished using an option under the View selection on The Menu )
What is this for? Sometimes you are looking for an alternate fingering for a note, but you are not interested in doing a trill - you just want an alternate, say, to make a particular passage easier to play. In such a case, the red trilling finger holes can be distracting. Even with the Trill Position indicator (the "^" or "v" showing whether the requested note is obtained with the trilling fingers up or down), it can be hard to read. By unchecking the Display Trill Fingers Checkbox, you will see the alternate fingerings with no red trill holes - i.e. plain, simple alternate fingerings.
What this tells the program to do is to close (fill with blue) any trill holes where the note is obtained with the trill fingers down, and to open (fill with white) any trill holes where the note is obtained with the trill fingers up. It also turns off the Trill Position indicator, which is meaningless when no trill fingers are displayed.
For example, when Display Trill Fingers Checkbox is checked, the display for one alternate for alto octave 2 A is:

When unchecked, the display appears like this:

Another example from alto octave 2 A, with Display Trill Fingers Checkbox checked:

and unchecked:

Depending on the design, some external files may deactivate this checkbox (in the permanently checked condition).
The setting of this control at program Startup can be picked using the Preferences dialog.