Hi folks,
I know this hasn't been commented on for a while, but I just upgraded to a brand new laptop with a much better screen and Mach 4 looked terrible. Quite a few things were so small as to be unreadable.
But all is not lost, as @joeaverage said, you can change the font size. But what he didn't say was that EVERYTHING about the screen sets can be changed. Font sizes, widths, tab heights, you name it. So while it's a bit of a pain and takes a bit to get it the way you want - you can definitely make use of your lovely new screen resolution. I'm now running at 3840 * 2160 and I have the screen looking just fine.
You do not need to change the resolution down to match (although this was definitely easier to work out what was going on).
I knew the screen sets could be modified but assumed it was for different machine types and/or requirements. My screen now matches my requirements (which include the resolution of my laptop).
I learnt something so thought I'd post in case it helps someone else.
Happy machining