It's a very useful way of capturing information that's on the display, using a feature called smart select. If you've been a Note user in the past, some of this might sound familiar.
Smart select is an edge panel, you can swipe into it from the edge screen.
Head into settings > display > edge screen > edge panels. Through this menu you can enable firstly edge screen itself, but also the smart select edge panel.
Head to the page you want to capture from.
Open the edge panel with a swipe until you get to smart select.
Choose the shape or type of selection you want to make - rectangle, circle, pin to screen or best of all, create a gif.
You'll return to the capture page with a frame for making that selection. Resize or reposition the frame and press done. If creating a gif, hit record, then stop when you're done.
You'll then be shown what you've been captured, with the option to draw, share, save and in the case of text, extract that text, so you can paste it elsewhere.
If pinning a selection, this will then have the captured selection hover over everything until you close it down. It's really useful for information you want refer to, like an address or reference number.
