Samsung Galaxy Z Flip's Flex Mode is a unique feature and a key selling point - the design of the hinge allows you to tilt the screen (and the cameras) at any angle that's convenient to you. Only a few apps support it, but as of today YouTube is one of them and so is Google Duo. You can watch videos on all 6.7 inches of the screen or you could fold it 90° and leave it on a table (kind of like a laptop). The updated YouTube app detects this and moves the video to the top half of the screen. The bottom half isn't wasted, however, instead it shows the rest of the YouTube interface,...
Source: https://www.gsmarena.com/googles_youtube_and_duo_now_support_galaxy_z_flips_flex_mode-news-42806.php
