Invoices & Receipts:
Navigate to settings -> Documents -> Invoice Receipt.
From here you will be viewing all the invoices and receipts
By hit on Edit, You can edit the invoices as display below
For example, You have planned to remove the Email ID all you need to do is unselect the item and click on save & preview. To view the updated changes.
As you can see from the above image, the Email Id has been disabled.