AUTO FOCUS

EDIT: 10/7/20 - This is the official and most recent method:

https://support.dronesmadeeasy.com/hc/en-us/community/posts/360058049771-Is-it-possible-to-disble-auto-focus

Double tap on where the autofocus should be calculated. Pick an area of high contrast. 

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Old answer:

You can do a long press on the area of the camera feed where you want the autofocus to be done. Choose an area of high contrast for best results.