When creating a new customer from ‘create’ button in the lead form, it didn’t fetch some fields from lead form. It fetches only fields with same name. Is there a way to do a custom mapping?
It is possible to customize forms to suit your needs, here is a link that may be helpful.
https://docs.erpnext.com/docs/user/manual/en/customize-erpnext/customize-form
If you have details about what fields are needed or are not working as expected, we may be able to help.