You can preview the video: from the beginning, a side-by-side, or a single scene.

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Click the preview button located at the top right side of your project dashboard.

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From the top-left side of your dashboard, click on show preview.

Right-click on the specific slide within the video timeline and select preview. The preview will start and end of that scene.

Alternatively, you can play the preview, then adjust the duration to where you want it to be. You can see the timestamps in the background on the timeline.