I don’t know of an equivalent feature while scrolling. You may have two replacements:
Display the Navigator in the side pane (click on the compass icon) and expand the Headings section.
The closest heading preceding cursor position is highlighted. This indication depends on the expansion degree of the headings. When they are fully expanded, you get the most precise hint. When only level-1 headings are shown, the cursor position is known only to the chapter.
But this shows only cursor position. It does not change when scrolling until you set the cursor somewhere else.
However if your goal is to scroll to a definite heading of your book, simply double-click on the heading in the navigator.
##Chapter heading in header
If this is relevant to your book, you can echo the current chapter name in the header. This is done with field insertion.
Since the chapter name (or number) is then displayed on any page, you can stop scrolling when you have reached your destination.
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