"By default, the device profile for android_high (which is used by phones such as the galaxy s8 and s9) gives a scale factor of 1.0 resulting in 1280x720. When choosing a ~2:1 device such as the galaxy s8 or s9, the UMG designer gives you a 1280x720 preview, which is the wrong aspect ratio.
Based on the table explanation here https://docs.unrealengine.com/en-us/Platforms/Mobile/Performance, setting MobileContentScaleFactor to 0 results in the native resolution getting used for that profile. When I do this, the UMG designer displays at a resolution of 0x0 when selecting devices using that profile, making it impossible to work with."
Also tested in Main @ CL 4235929
1. Create a UMG Widget
2. Select Screen Size -> Phones -> Galaxy S8 or S9
Result: The designer preview displays a 1280x720 (16:9) preview
Expected: The designer preview displays a 18.5:9 aspect ratio preview. Ideally displaying at device's native resolution.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-62301 in the post.