Page Customization

I have created two different Case form pages for Business A and Business B, each in separate packages (Package A and Package B). In the Case object, under the Pages setup, I’ve configured the appropriate form to display based on the Business field value (please refer to the attached screenshot 1).

However, on the Case list page, when clicking the "New" button, both form options appear in the dropdown (please refer to the attached screenshot 2).

Could you please guide me on how to show or hide the options in the "New" dropdown based on the current user's business value?