The number of device targets and screen sizes across the Windows 10 ecosystem is too great to worry about optimizing your UI for each one. Instead, we recommended designing for a few key widths (also called "breakpoints"): 360, 640, 1024 and 1366 epx.
Tip When designing for specific breakpoints, design for the amount of screen space available to your app (the app's window). When the app is running full-screen, the app window is the same size as the screen, but in other cases, it's smaller.
This table describes the different size classes and provides general recommendations for tailoring for those size classes.