I have a Kit with components that are all non-inventory items for resale. The Display Components on Transactions is checked. But, when I create a new Invoice and add the Kit, it doesn't show the components. Any reason for that?

I think it is a native functionality. Do you see the components when you print the invoice?

Yes, but only when I print it. I want to see it on the UI or form itself, so that I can edit the components and/or quantities.

That preference only impacts what you see on the PDF It doesn’t impact what you see in the UI