"Run construction script in sequencer" - toggle not found. UE 4.17.1

Development Cinematics & Media
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Tried to follow this video (around 41:01 in time) Sequencer Updates in 4.17 | Feature Highlight | Unreal Engine - YouTube
but I’m missing the “Run construction script in sequencer” toggle box.

213039-unreal-video-screen-grab-at-time-41-01.jpg
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213040-my-screen-grab-class-settings.jpg
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Apologies, this won’t be available until 4.18.