You can toggle the visibility of extended hours data (pre-market and post-market price action) within the Market Replay interface.
Steps to view pre and post-market data:
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Navigate to Market Replay from the left navigation menu.
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Click the Widgets / Layout icon (four square grid with a plus icon) located in the top-right toolbar.
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In the side panel that opens on the right, locate the MARKET TIMELINE section.
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Toggle on the View Pre/Post Price Actions switch.
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The chart and timeline will update immediately to display extended trading hours data.