Parallels, Windows, Enterprise-Architect and Retina

in principle, a great combo. With Win-7, Parallels works like a charm, nicely integrated with my Mac, no issues with the high Retina display resolution.

When I used EnterpriseArchitect for some UML modeling, I encountered serious display
issues: diagrams were suddenly scattered with overly large fonts and became utterly unreadable.

So back to virtual machine configuration: Shutdown the VM instance and open the Parallels configuration "graphics" tab. Choose "optimized for retina" mode, as shown below:

Not that difficult... boot Windows again.

Open the "display preferences" page and try the following screen resolution:

That completely solved the issue for me.