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  1. edit the table of contents to remove its protection:
    • right click on the table of contents and select Edit index;
    • on the Type tab, uncheck Protected against manual changes; and
    • click OK.
  2. place the cursor at the beginning of the file or the section (if your cursor is on the Table of Contents, then the next step won’t work);
  3. press Alt+↵ Enter, release both keys, and press them again; and
  4. edit the table of contents again to protect it;