Set UMG Screen size to 800x480

I need to desgn my UI to work at 800x480. I pull down the screen sizes I several apple devices and TVs and other specific things, but I cannot find any with the exact resolution I need 800x480. How do I Add a device or change the settings to get that resolution.

I also know its a 7 inch tablet so I could theoretically set the DPI as well.

The only solution I know is changing your Play window size in the Editor Preferences (Level Editor → Play). Might be annoying though to always press Play and check the resolution.

Yeah, thats what I am doing right now is using the 960x640 settings to build my UMG s o its “close” then test in play mode at that resolution but not the best workflow. Ideally I want to set the UMG setting.

Micheal Allar just posted this solution, all props to him.