Huawei Mate 9 - Manual (Page 51)

Capturing part of the screen
Knock the screen with your knuckle. Keep your knuckle on the screen and encircle the area you
want to capture. The area inside the blue line will be captured.
To use a predefined shape, select the screenshot box at the top of the screen, and then touch
to save the screenshot.
By default, screenshots are stored in Gallery, within the Screenshots folder.
After creating a screenshot, touch Share to share it with friends.
Taking scrolling screenshots
Use scrolling screenshots to take screenshots longer than one page (such as web pages or
conversation threads).
Screen and Display
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