Dropdown menu View in Flutter - flutter

I have a dropdown in my app like this.
at beginning i am showing "Choose Filters" as the dropdown hint, once any of the item in dropdown in selected and there is a button as + icon once pressed I am doing further operations.
If an option is selected in dropdown its visible in the app, what I want to do is after selecting an option if clicks on that + icon I want instead of that selected dropdown value display the hint i.e "Choose Filters" . Is there any way to that please let me know.Thanks!

If you want the DropdownButton to show the hint again, you need to set it's selected value to null. So the variable you are setting on the property value of the DropdownButton should be set to null.

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