Screen Lock is a hugely useful control to let the user stop the screen from moving while editing and auditioning a single note or a small range of notes.
Screen Lock will turn ON with two separate mechanisms:
If you select one or more notes (in this case, turn it OFF by clicking on an empty area in the main screen)
If you click the Screen Lock Button, which will turn RED when ON: (In this case, you need to click the Screen Lock button again to turn it OFF)
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If you select one or more notes
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If you click the Screen Lock Button, which will turn RED when ON:
The pop-up tool-tip also explains this:(in this case, turn it OFF by clicking on an empty area in the main screen)
(In this case, you need to click the Screen Lock button again to turn it OFF)