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Yuen Lye KonYuen Lye Kon 

Show classic view of New contact when selecting "+ New contact" option in Contact lookup

Hi,
For Salesforce Lightning in a Case detail view, there's a lookup field called Contact Name. When I'm trying to create a new contact via the lookup field by selecting "+ New Contact" option.

User-added image

The below New Contact dialog in Lightning view is displayed.
User-added image

Is it possible to show the Classic view version of New Contact instead? The output that I'm expecting looks something like the screenshot below.

User-added image
VinayVinay (Salesforce Developers) 
Hi Yuen,

This might not be possible since this is standard inbuilt functionality in salesforce.

If you want to customize then you might need to build custom code logic and display UI as per your requirement.

Thanks,
Vinay Kumar