How to change video duration while creating composition?

How to change video duration while creating composition?

Modifying the video duration during composition creation is not permitted to prevent interruptions in video playback. Unfortunately, this feature is not currently supported within Pickcel.

Support links:
1. How to create a composition?
2. Can I add multiple videos in my composition ?
3. What are the media file formats supported in Pickcel?
4. Is 4k video supported in Pickcel ?