I’m removing this from ideas because this has been basically implemented in the latest version (22.7.4.161). All transactions are now using the same layout logic.
One exception is sales invoices where I need to be sure everything is working properly before rolling out to everyone.
Therefore on sales invoices, there is temporary checkbox New layout which will enable it on per-invoice basis.
I encourage you to check it so you can see how new layout turns out on your invoices and to see what issues there are still to address.