Scaling with No DPI scaling selected

[Boppyman]

Hi, I'm having issues with scaling even with "No DPI scaling" selected.

I know you are aware of the window being cut off when "No DPI scaling" is selected but if I select it I got the pic below where it's squashed into a small window and I can't see the "Convert" button

I'm using a 4K TV and My resolution is 3840x2160 (recommended) and the scaling is at 300% (recommended)

Is there any workaround for this other than changing my resolution or scaling in windows, which I don't really want to do as it messes other things up for me? I tried changing the DPI scaling in the NamDHC.exe properties with and without "No DPI scaling" selected but still no joy.