In LO Writer, how to set Ctrl+6 as keyboard shortcut for the Heading 6 style?

  1. Select Tools -> Customize -> Keyboard
  2. On the Shortcut Keys list, find Ctrl+6.
  3. On Category list, select Styles -> Paragraph.
  4. On the Function List, select Heading 6.
  5. Click Modify. Click OK

LibreOffice Writer - Customize window