How to change customer number as default

I have customer name as default field, so in search customer when we search by number and press new customer the value insearch item goes to name, i want it to go in number.

The only way I could see you being able to do that is to change the fields on the customer. Make the primary field Customer Number instead of Name and add Name as a custom field. You’ll need to update tags on your receipt and other places you are referencing customer details because the {ENTITY NAME:Customers} will now be the customer number and the customer name you will need to access via {ENTITY DATA:Customers:Name}.