You can hide/show cautionary accidentals if you use the common practice accidental duration rule.
Procedure
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Press Ctrl/Cmd-Shift-N to open Notation Options.
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In the Flows list, select the flows in which you want to hide/show cautionary accidentals.
By default, only the current flow is selected when you open the dialog.
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Click Accidentals in the page list.
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In the Basic section, choose Common practice for Accidental duration rule.
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In the Cautionary accidentals section, choose the options that you want to apply to the selected flows.
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Click Apply, then Close.