This article should assist you need to change Webconfig and then you can change it in Sitemap or on the screen

https://www.augforums.com/forums/everything-else/new-ui-in-acumatica-2023-r1-23-100-0138/

Thanks Dermot but I dont see anything there about the mobile screens.

Sorry @jmorgan i missed the mobile app part. I dont believe there is any modern UI for the mobile app (i have noticed the recent updates to the app are making it look more modern) but the screen design/layout is controlled by the scripting.

OK thanks.   I thought I had seen a 24R2 preview demo with Acumatica running on a mobile but I suppose that this was using the browser.