I am submitting this suggestion, originating from a support case, on behalf of the user who requested the support.

It would be very useful to have a global flag that adjusts margins, paddings, and spacings to better suit desktop platforms.

Currently, some Qt Quick Controls styles are not well-optimized for desktop use under certain conditions. For example, in the FluentWinUI3 style, controls appear much larger than their QWidget counterparts, and the default font size is also significantly bigger. (See the attached screenshot: the left shows Qt Quick, while the right shows QWidget. This behavior can be reproduced using the attached example application.)

This discrepancy can negatively impact UI design on desktop, where applications often need to fit a large number of controls into limited space.

Since this issue appears to affect all Qt Quick Controls styles, I propose adding a global flag or configuration option that optimizes these styles for desktop platforms.