With the 2019 release wave 2 plan, finally, we can customize the opportunity close dialog box (Unified Interface only)
Enable it from the Sales tab of System Settings dialog box.

The default out of the box Close Opportunity Dialog Box à

Now to add or remove fields to the dialog box, we need to customize the Quick Create form of Close Opportunity entity.

Change the ordering of the fields, added a custom field, removed Competitor and Description dialog box.

Updated Close Opportunity Dialog Box

We can use client-side validation on it

We can specify business rules

We can also customize the Main (Information) form.

This form can be used to check the details of closed opportunities.
Entity Relationships cannot be customized.

Great to see the feature available as it was one of the most requested features in the product.
https://experience.dynamics.com/ideas/idea/?ideaid=4792dfee-121a-e611-80e2-c4346badc228
Hope it helps..
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Hi thank for sharing your findings on this most requested feature. Can you provide more detail on how to customize the dialog box?
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Sorry I meant the validation popup.
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Hi thank for sharing your findings on this most requested feature. Can you provide more detail on how to customize the validation popup?
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Hi Nishant, do you know if this is going to come to on-premise instances?
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Hi Phil no idea when we will have this for on-premise.
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