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Do you want to increase the entire Grouped Values Dropdown widget like this?
To achieve that add this CSS code inside of Grouped Values Dropdown widget Custom CSS field:
I have set height to 500px inside of my form. You can use any other height value inside of you form. Here is my cloned form: https://form.jotform.com/62175435565965
Feel free to clone it.
Hope this will help. let us know if you need further assistance.