Check if "All" have been selected

Hello everyone, I am trying to create an If clause and would like to verify if “All” is selected. The clearest example is:
Country / Province / City

If country = “All,” country dimension, Province

This is precisely what I would like to do.

It will allow me to define which object will appear based on my filter selection.

Hey @woliveiras. Typically the condition to check if parameter is set to the All selection is a control is by using isNull(${parameter_name}).

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Thank you @darcoli , I really appreciate your support. Just one more question. what static value could i use as default parameter to select “All”.
I didn’t fill in the default parameter and when I try to use it in my calculation field, quicksight asks me about the Default value.