Playback and Recording : Playing Back Track Material : Scrolling Options : Page Scrolling During Playback

Page Scrolling During Playback
You can set Pro Tools to scroll the track display while playing, and also have the edit cursor appear wherever playback stops.
To make the track display and the edit cursor follow playback:
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Enable the Timeline Insertion/Play Start Marker Follows Playback button in the Edit window.
 
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You can enable or disable the TimelineInsertion/Play Start Marker Follows Playback option in the Operation Preferences.
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Press Control+N (Mac) or Start+N (Windows) to toggle the Timeline Insertion/Play Start Marker Follows Playback preference on and off.