Canon MG7700 Series Online Manual page 276

Flick left or right and tap the date of photos to display.
Tap F to enlarge/reduce the photo.
Tap K to enlarge the photo and L to reduce it.
Drag your finger on the photo to display the part you want to see.
Tap G to display the Settings screen.
Drag the screen up or down and tap an item to select.
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