I try define a print layout but the M.App Desktop show the message in the first image (Desktop01).
I try use the default layout that you can see in the second image (desktop02) and associated with the desktop application (desktop03) but the message in below always appears.
Do you have any idea what might be going wrong?
Nota: When I try create a new layout the page setup don't appears to setup a page size or any other configuration.
You must make sure, that the default printer has a default print page the same as what is defined in the PrintLayout. Or, create a PrintLayout that has the same page specified as the default printer's default page. Similar happened to me too in the past and then I found that my default printer had Letter instead of A4 as the standard paper format.
The Page Setup can be defined in the PrintLayout Editor's File menu but unfortunately there seems to be a problem with it in the latest 2019 Update 3 where it doesn't work Bug report against that was filled.