I’d say develop for 1920*1080 and make sure you test in various formats (UMG has a great way of letting you see your UI in various devices’ resolutions). The image size of course depends on what you want to do with it, but keep images in 2^x size (1024, 2048 would be a good general idea, with those images containing multiple tiles for use across various materials to keep your draw calls down). Not sure if that’ll help you out but had a second to spare, so there ya go. Have fun!
Oh, and some devices are now in 4k, lol. That’s imo a bit ridiculous, unless you constantly connect your mobile screen straight to your 4K TV. Which I have never seen anyone do in my life.
Sweet thanks. Reported an bug recently about viewing other device resolutions which made me waste quite an bit of time learning it was zooming in causing crashes.