These settings do not seem to change the size of the titlebar buttons on Windows 7 (tried on two PCs). I've tried values from 10 to 300 and after restarting DisplayFusion they are always at the default size. The icon scaling works, but setting that smaller does not affect the button size either.

I have configured my Windows display settings to make the taskbar smaller and consequently the DisplayFusion titlebar buttons are too big. See attached image, taken from a Firefox window.

Thanks, fixed in 9.1 final.