Taking a screenshot is as easy as just pressing home and power button on your S7. But it just captures the current view and not the entire page or menu. To take scrolling screenshot on Galaxy S7 & S7 Edge and capture the entire screen, do as follows:
1. Capture a normal screenshot (Swipe your palm over the screen, or press and hold both Power Key and Home Button
2. When the screen is captured, look at the bottom of the screen and find the Capture More button
3. Tap the Capture More button, so your Galaxy S7 (Edge) will scroll down the page automatically and capture the screen again.
4. Keep tapping the Capture More until you have captured all the things you need.
Note that, you may use the Crop option to delete unrelated content to your scrolling screenshot on Galaxy S7 / Galaxy S7 Edge.