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The configurable list widget doesn't accept media queries on its "Custom CSS" tab, so we can't adjust its size with respect to the screen resolution. However, you have several methods to make your form responsive, you can see them from the guide below:
Also, you can try to use the following code in its "Custom CSS" tab:
This one will make it fit to the mobile screens, please see it from the following:
For further assistance, please do let us know.