How can to add, remove, and change the position/size of subtitles?

You can add or remove subtitles by prompting the magic box to do so and clicking the Generate option:

For example:

You can change the position of subtitles to move the subtitles to the top, centre, or bottom. Or you can prompt to have the subtitles be at a specific position from the top or bottom!
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For example:

For changing the size of the subtitles it can be anywhere between 50 to 100 by giving the below commands:

Preview your video once the changes have been made!