score:1

One possibility might be to define your sidebarToggle function within the component you are using.(Maybe because calling it inside Component the code might be running in _app.js instead of your component this is a big maybe! but worth a try)

Here _app.js is a wrapper around your application and I don't think it is suited to be used at the topmost component to hold state. Better to make a simple react root Component do that!


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