ATEN StreamLIVE PRO All-in-One Multichannel AV Mixer - Manual (Page 55)

Chapter 4. ATEN OnAir PRO App & Video
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Crop (Media Only)
To resize a media, tap the media. An example is shown:
Tap the Resize/Crop Tool to start the tool.
Pinch your finger inward or outward to crop. A small box is on the left of the
“Scene Display” region to show the display area (cropped area).
When completed, tap DONE on the top right corner.