It seems that under macOS Mojave's Dark Mode, QWizards are difficult to read and do not display well compared to under Light Mode (or older versions of macOS) when using the default WizardStyle QWizard::MacStyle. The shaded area that the UI components are housed in is too light compared to the coloring of the elements inside of it. The attached screenshot shows an example of this using the a page from the Class Wizard example, where it is difficult to visually contrast each element from the background.