Custom Search Field not working properly

Hi !
from customize from i add a field in search fields but it didn’t take effect
Here are the images :


In the first image it shows the email address in the when searching but when i put the email address like testing@ it shows the new customer kind of thing but i want to search customer based on their email address.
Here is the image of customize form of customer :

Can anyone help me through this how can i resolve this ?
Any kind of suggestion will be very helpful.
Thanks so much in advance.

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I encountered a similar issue and was able to find a solution.