Proper window size and layout size for Construct 2 Mobile Games

When creating a new mobile game, make sure to select:

That is, the windows size is 16:9  aspect ratio, i.e. windows size: 480 x 854 either landscape or portrait:

Also, be sure to set the Fullscreen in browser to:  Scale inner.

After building the apk files, testing on Samsung Galaxy Tab4 tablet and Redmi Note2, below is the result: