The Crop and Straighten & Rotate modules use controls similar to other apps for their edits, but most of the other tools work in a central “cross” configuration: Drag up and down to select the type of adjustment you want to make, and then drag left or right to increase or decrease the amount of the adjustment. (Dragging up or down also works.) Positioning your finger farther away from the center of the image affords more granular adjustments. If you need to straighten or rotate the image, tap the Straighten & Rotate module and do this:
To switch between landscape and portrait orientation for the selection area, tap the Rotate button. 4.3 The crop area is constrained to the 16:9 ratio.