How to add a device or resolution to the Widget Editor's Screen Size options?

Hello! I’m new to UE4, so this might be a noob question, but…

In the Widget Editor, there is a button in the top-right, called “Screen Size”, where you can choose a device/resolution. My mobile test device is unfortunately not in the list, and I’d like to add it to the “standards”, such that the option is available for this project (my first) and, preferably, for all future projects.

How can I add a custom device/resolution to this menu?

Still need help…

In the top right corner of the viewer in designer mode you cold see drop-down buttons “screen size” and “fill screen”. In “fill screen” drop down list choose “custom” layout of this to buttons will change for “width” and “height” where you could set custom size. Hope it will help.

No, it doesn’t work, because it doesn’t affect DPI, just current widget size. You need this Custom UE4 UMG "Screen Sizes" Configuration