The issue is simple enough for the majority of us who use Windows 10 with a single display. (Portable or desktop, it doesn’t matter.) If the resolution of the display on that PC is high enough, and the physical size of that display is small enough, then you’ve got what’s called a high DPI display. And you will need to scale the UI in order to make commonly-used interfaces—icons, buttons, text, whatever—readable and usable.
Where this functionality falls apart is legacy apps, especially older desktop applications that have never been updated for these modern display types. For example, my well-worn copy of Adobe Photoshop Elements 11 still works just fine on my desktop PC, where the display scaling on the 27-inch 1080p display is set to 100 percent. But on modern portable computers, like Surface Book, the menus and other onscreen interfaces are too tiny to read or accurately select because this app doesn’t scale. I had to buy a more modern version, Photoshop Elements 14, to use on these devices. That version
does scale.
I mention a coincidence. Just yesterday,
Microsoft published yet another lengthy blog post describing the challenges of high DPI displays and how it is continually improving the OS to make it better. Speaking of challenges, I challenge you to actually read it. It’s dense, and tough-going. But if you slog through all of it, the conclusion is obvious enough: Microsoft will never really fix this problem. Not really.