Dependency of toolbar icon size from Windows zoom factor

Dear all,

I want to support certain palettes (modified equation palette, vertical tool bar) for higher resultion screens. You all do know the passage from Help/User guide:

FrameMaker's user interface is now compatible with high-resolution screens ranging up to 3480 x
2160 pixels. Earlier, when you launched FrameMaker on a high-resolution display device, the text on
the user interface would render too small. You would have to use a workaround to overcome this
problem for earlier versions of FrameMaker. However, starting from 2017 release, FrameMaker
supports high-resolution display devices. The user interface and all text automatically resizes as per
Windows display settings.

But there no mentioning of when size small (100%), medium (150%) and large (200%) of the icons is taken. In particular, is the medium size taken for Windows zoom factor 101 … 150 or what?

Can somebody give me a hint?