IIF Function return either True or False

Hi all, trust you are well.

MS Access - building a query. I have a Y/N field.

Based on a Tick box on a form: If the tick box is true - return all the values, if the tick box is false - return only false.

I tried this: IIf([forms]![activityBar]![CaseM]=True,OR(True,False),False)

Clearly doesnt work.
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 >= IIf([forms]![activityBar]![CaseM]=True,-1, 0) 

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Microsoft Access

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