Invoice Number not appearing in invoice

Im using Manager with Mac OS Catalina. When I create an invoice there is no invoice number.
If you look at attached screenshot of Northwind Traders you see an invoice number.
When you look at mine Ramrod Studio there is no invoice number.
Hope someone can help as I love this program.

Its OK Worked it out
I ticked on reference and then a box with automatic popped up

It seems that you are a new user of Manager

Please read the guides as they cover all aspects of using Manager and have many examples of how to enter transactions.

What you saw is a basic feature of Manager. I f there is no content in a particular field, that field and its label do not appear.