Customize close opportunity form => Quick create not showing

I'm trying to customize the close opportunity form.
I have already enabled the setting. But I still see the old dialogs and not the quick create.

These two link I followed:
https://docs.microsoft.com/en-us/dynamics365/sales-enterprise/enable-opportunity-close-customization
https://docs.microsoft.com/en-us/dynamics365/sales-enterprise/customize-opportunity-close-experience

What extra steps are necessary to get the quick create forms instead of the dialogs?