Samsung Galaxy S6 User Manual page 159

Change the Video Screen Size
You can change the size of the video is several ways during video
playback.
1. From a Home screen, tap
2. Tap a video to view it.
3. Tap the screen ratio icon to cycle through the screen size options:
Full: The entire screen is used, which may cause some
•
minor distortion.
Keep ratio: The video is enlarged to fit the screen without
•
becoming distorted.
Applications
Apps > Video.
147 Video Player