Canon MG7100 series Online Manual page 111

Drag
While lightly touching the screen, move your finger up, down, left, or right.
Use to view lists of items or move sliders.
An Operation Example of the touch screen
Example: Operating the touch screen in the photo selection screen
Flick your finger left or right on a photo to display the next or previous photo.
You can also tap the marks (C) to do the same. To move continuously forwards or
backwards through photos, hold your touch on either of the marks (C).
Tap (D) to switch to a screen that displays multiple photos.
111