Editor viewport aspect ratio

Development Pipeline & Plugins
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  1. In the editor there is a drop-down menu next to the Play button. From this menu, choose “Advanced Settings…”.

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  1. Under the “Play in New Window” section set the “New Window Size” to the size and aspect ratio you would like.

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  1. From that Play context menu, instead of “Selected Viewport” mode, choose “New Editor Window (PIE)”.

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From now on, when you click on “Play”, it will launch a window that is the size and aspect ratio you want.

Answer is based on Unreal Editor v4.18.3; the interface may change in the future.

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