While your video is generating, you can continue working on other projects. All you have to do is select the 'Run in background' button on the video generation pop-up.

Please note that it would take a few seconds for this button to be activated.
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To see the progress of the video generation, please click on the bell icon on the top right.

Once the video is generated, you will see an In-App notification/pop-up as well as receive an email, if notifications are enabled as in the screenshot below

Please see, clicking on the 'x' on either of the screens will stop the video generation.