I also copied the 6 files over to MoI3, ui file after renaming default names to *BAK.png.
Legibility with MoI3 is improved for my 4k monitor.

The images are still 64 X 64 pixels. Less pixels are transparent.

An earlier quick attempt to just quadruple the pixels to 128 X 128, without enlarging the non-transparent pixel image, did not seem to change size or legibility.
Memory use goes up. No plans at present to make any further attempts at much larger edit frame controls.

The MoI5 beta, improved legibility for 28", "4k" monitor, applies to both Dark and Default color themes.
(Did not try putting the modifications in either Theme folder. I see that I have a Theme folder in AppData, and also in MoI4beta ui file.)

- Brian