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It should be possible to modify the Close opportunity form. The same way that As is it possible to modify in the next release the close opportunity form : https://docs.microsoft.com/en-us/business-applications-release-notes/April19/service/dynamics365-customer-service/case-management-case-resolution-extensibility

Category: Lead Management
STATUS DETAILS
Completed
Ideas Administrator

Thank you for your feedback!

It is now possible to customize the close opportunity dialog. Check out Customize the Opportunity Close form in Dynamics 365 Sales | Microsoft Learn