Qt 5.14 added improved support for fractional scaling thereby making it easier for UI elements to "match font sizes and also the UI sizes of other applications" on systems with fractional scaling enabled (e.g., for users of Windows 10 with a global "Scale and layout" value set to 150% or similar). This support can be enabled by setting the application's HighDpiScaleFactorRoundingPolicy to PassThrough.

Gridsync should enable this flag in order to better support users with high DPI screens.