You can hide/show cautionary accidentals if you use the common practice accidental duration rule.
Procedure
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In Write mode, choose .
The Notation Options dialog opens.
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In the Flows list, select the flows in which you want to hide/show cautionary accidentals in one of the following ways:
By default, only the current flow is selected when you open the dialog.
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Select Accidentals from the Category menu.
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In the Cautionary (courtesy) accidentals section, choose the options that you want to apply to your project.
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Click Apply, then Close.