Collabora Office 21.06 ヘルプ
To move a numbered or bulleted paragraph down one chapter level, click at the beginning of the paragraph, and then press Tab.
To move a numbered or bulleted paragraph up one chapter level, click at the beginning of the paragraph, and then press Shift+Tab.
To insert a tab between the number or bullet and the paragraph text, click at the beginning of the paragraph, and then press CommandCtrl+Tab.