You cannot adjust the Window size to the iPhone 6 or iPhone 6 + preset Common Window Sizes in the Editor Preferences.
Regression: this did not occur in UE 4.10
NOTE: This does not occur in New Editor Window (PIE)
NOTE: This does not occur with all window sizes: detected for iPhone 6 & 6 + Portrait (iPhone 4 Portrait works as expected)
NOTE: I was only able to reproduce this for iPhone 6 or 6+ Portrait Mode (Landscape is working as expected.)
*Update: iPhone 5 Portrait failed on Macbook Pro but reportedly works if the monitor is adjustable to a high enough resolution.
#. Open a blank blueprint project in UE4.11.1
#. In Menu, make sure Play> Standalone Game is selected
#. In Drop down menu, scroll to bottom and select "Advanced Setting (Alternatively, open Editor Preferences>Level Editor>Play)
#. In Play in Standalone Game>Standalone Window Size; Adjust Window Width and Window Height to: Common Window sizes, 19” monitor: 1440W x 900H
#. In Editor press "play" to start PIE in New Editor Window
#. RESULT: Standalone Game Window is 1440 x 900 pixels (expected)
#. Now, change settings from Step 5 above to: Common Window Sizes: Apple iPhone 6 (Portrait): 750W X 1334H
#. RESULT: Standalone Game Window remains 1440 x 900 pixels
#. EXPECTED: Standalone Game Window to adjust to 750W x 1334H
#. Repeat all steps above, changing "Stand Alone Game " to "Mobile Preview (PIE)" in the menu and change settings accordingly in the following location: Editor Preferences>Level Editor>Play>Play in Standalone Game
#. RESULT: Mobile Preview Window remains 1440 x 900 pixels
#. EXPECTED: Mobile Preview Window to adjust to 750W x 1334H
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