Hi lawilliams713,
By default Form Header Title shows "New <Entity Type>" (Like New Lead) when user creates one new record.
And it shows value of primary field which is the FullName for the lead entity when user edit records(after clicking save button).
By default Form Header Title shows "New <Entity Type>" (Like New Lead) when user creates one new record.
And it shows value of primary field which is the FullName for the lead entity when user edit records(after clicking save button).
This diagram represents common components found in updated entity forms.
There is no OOB way to change it currently.
Maybe you can refer to the following thread to use code to change it.