Two monitors: primary at 1920x1200 at 100% scaling, secondary at 2160x3840 (portrait) at 200% scaling. Have not adjusted scaling at any point since setting up this configuration. DF is handling the task bar on the secondary monitor.
Everything is fine on the primary monitor.
On the 4K monitor:
The title bar font and the radio buttons/checkboxes on the DisplayFusion config screens are not scaled up correctly:
The taskbar font and the hidden notification icons are also too small. But the main app icons and the non-hidden notification icons on the taskbar and the clock font are correctly scaled:
Unfortunately these are known scaling issues that we're still working to fix. They're caused by limitations in the .NET Framework and Windows API. I've added your info to the open ticket, and we'll definitely let you know when we're able to get them all fixed up
