The "aspect ratio" of a video refers to whether the video is horizontal (landscape mode, also referred to as 16:9), vertical (portrait mode, also referred to as 9:16), or square (a 1:1 aspect ratio).
1. Open the relevant video.
2. Click on Crop, Captions, Logo, Green Replace.
3. Choose style with captions or style without captions, according to your preference.
4. From here you have 2 options:
Change the aspect ratio to square, horizontal or vertical.
Crop the video to resize it to a different aspect ratio.
5. Click on Next to continue styling your video.