Be sure to test that all your applications display correctly after changing DPI.

I've seen buttons and text disappear when changing the DPI to anything over 100%. This was on a .net based application.

The feedback from the application provider is that they only support 100% DPI.

With the user having a 1920 x 1080 native screen on their new laptop with 15.6" screen and with them not having the best eyesight, the only option available to us has been to furnish them with a 23" widescreen.