See related items in list, not as "icons"

Is it possible to see the related records as “line items”
I mean… on an invoice… Now… I see the invoice and the line items are all Icons. But I would like a layout where I have The invoice, with the Customer, its address, then the line items with Qty and Price and Total and Grand Total and all taxes… But not just a printlayout. One I can work in…
I have not yet found how to do this.

It sounds like you’d benefit from either using Interfaces or a tool like Amplify.

The advantage of using Amplify is that it comes with a bunch of extra features and adding/linking new records is a breeze (use the “Linked Table Viewer” layout). With Interfaces, there’s no extra costs but the functionality is still a bit limited (including the inability to add new records easily).