Напрямую никак.
Решение: создать новый стиль оформления страниц, и назначить этот стиль тем страницам, на которых не должно быть колонтитула.
Format > Styles and Formatting > select Page Styles icon at top:
Then:
- Create a new page style based on the Default Style page style (right-click > New…).
- Organiser tab > give this new style a meaningful name (e.g., «No header / footer») > set Next Style to «Default Style».
- Header tab > uncheck Header on.
- Footer tab > uncheck Footer on.
- Click OK.
- Place the cursor at the end of the content on the page prior to the page to have no header / footer.
- Insert > Manual Break… > Type of «Page Break» > Style of «No header / footer» > click OK.
- Press DEL (if required to remove carriage return or page break in front of cursor).
- Repeat steps 6-8 for each page to have header / footer area suppressed.
For documents using direct formatting (e.g., Format > Page…) the same process should work, although to what degree, will depend on how the direct formatting has been applied and to what extent.