You can find the Collage crop tool by clicking the photo that needs to be cropped, and then clicking the Crop button that appears in the new photo editing toolbar.  

This will open the crop feature. Use the white circles on the edges of the photo and drag in and out to adjust how your photo is cropped. Click Done when it is cropped as desired.

You can easily undo cropping here by reselecting the cropped photo and then adjusting the bars back to their original position. 

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