This still is not working, and by being forced into the "New Invoice Experience," the old way of using a non-printing character to force a line is no longer working for it now forces a "0.00" at the end of the line in the Amount column. 

There's no apparent workaround. I'm forced back to having no lines between items which make the invoices look scrunched.

PLEASE  add a very simple "Insert line" in designing the Invoice template with no $0.00 printing at the end of the line. So many people have requested this, and it falls on deaf ears for years now.