I noticed that the Mobile Preview (PIE) cannot launch in any of the portrait presets in the “Play In Standalone Game” section of the Editor Preferences. EDIT: The “Standalone Game” option (which uses SM5) also cannot launch in portrait. However, launching in “Play in New Editor Window” works correctly.
This unexpected behavior occurs only when running my 1440p monitor at 1080p (since the Editor does not yet feature scaling for High DPI monitors). When the monitor is set to its native 2560 x 1440p resolution, the Mobile Preview launches in its portrait mode correctly, the same as “Play in New Editor Window”.
Thanks for your time and attention to this matter.
Whoa! In 4.14.0, portrait mode is working for me for the iPhone 6 preset (750 x 1334) in Play in Standalone Game (when running my monitor at 1440p and 120% dpi scaling in Windows). Any bigger preset though, such as the iPhone 6+ preset, seems to default to a 4:3-ish window unless you’re running at 100% dpi scaling in Windows. At any rate, this is an awesome surprise and a huge life-saver! Combined with the fantastic clarity of the new HighDPI mode, I have never enjoyed working inside of UE4 more!!!
This issue has already been reported as UE-29366. I have retested this issue and added some additional information you have provided here. You can track the progress of this issue from the following link: Unreal Engine Issues: UE-29366
Glad to hear it is working to your liking. As I’ve posted above, this is still in que to be worked on so it may ultimately be resolved for other resolutions as well.
That’s great to hear, ! Thanks for the link. Yes, it certainly would be nice to have it working in other resolutions also for testing purposes, so I’m glad that the issue has been noted. Have a great evening!
If, like me, anyone else was still wondering about this: It seems the resolution is multiplied by the Windows DPI scaling, so if you’re at 200%, it might exceed some maximum allowed resolution and use a fallback instead. As a solution, you can switch the DPI scaling to 100%, or leave it at 200% and half the resolution you’re entering in Editor Preferences → Play → New Viewport Resolution
Thanks for the tips. I’m now in the habit of leaving the Widget Reflector window docked in Unreal Engine and just increasing the “Application Scale” to 1.2 every time I open my project. That way I can leave Windows’ scaling at 125%. However, I haven’t launched a portrait mode preview for awhile so can’t confirm if there’s any issues.
