I don't know what is line in the level sequencer panel

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Those are the playback ranges. In your case, you’re looking at a shot from the context of a master sequence. So those lines indicate where in this shot the master sequence cuts in and out of. Here’s the official documentation on that:

https://docs.unrealengine.com/en-US/Engine/Sequencer/Overview/index.html#playbackrange

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Those are the playback ranges. In your case, you’re looking at a shot from the context of a master sequence. So those lines indicate where in this shot the master sequence cuts in and out of. Here’s the official documentation on that:

https://docs.unrealengine.com/en-US/Engine/Sequencer/Overview/index.html#playbackrange