When I run Quicken / Quickbooks the application doesn't look right, everything is blurry, buttons are not displayed properly, the resolution is pixelated and program's interface is too small.
Quicken, Quickbooks and many other Windows-based programs are not adapted for Retina display resolution, therefore Windows resolution becomes very high thus in-program fonts get too small, user interface buttons or images are not rendered properly.
You can optimize resolution settings either in Windows virtual machine's configuration or in Quicken / Quickbooks.
- In the virtual machine's configuration go to Hardware > Graphics > change the resolution type to Scaled mode.
NOTE: There was a major Scaled mode improvement in Parallels Desktop 13 in comparison to the previous versions.
- If you have Windows 10 Creators Update (1703 build) or later you can change resolution scaling for Quicken / Quickbooks in its Properties.
Right click on the application executable > go to Properties > Compatibility > Settings > check Override high DPI scaling behavior checkbox > then select System (Enhanced) setting > hit OK > Apply.
NOTE: You can check what Windows 10 build you have using the official Microsoft article.
For more information about Retina resolution issues in Windows-based programs refer to KB119926.