On toolbar, click the button.
Every document and index in Hyperview is listed in some index in the project. Synch Table of Contents causes this index to be displayed for the topic which currently has focus (shown with a magenta outline).
Usually the topic you are synchronizing will be in the content pane, and the index will appear in the index pane, but a sub-index in the index pane can also be synchronized. In this case, the index one of whose links is the name of the subindex will be shown in the index pane, replacing the original sub-index.
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