Callbacks in return from function

I’m editing the financial report template for my own purposes. In app.py they make a callback of the function overview.create_layout(app) and they describe this function as:

def create_layout(app):
    return html.Div([
        ...
    ])

My question is the next. I want to use a callback for a dropdown filter but I don’t know where to put the @app.callback in the create_layout(app), if I have to put it inside. Everytime I run the code the dropdown does not filter by the callback condition

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