LibreOffice 24.2:n ohje
To move a numbered or bulleted list paragraph down one list level, click at the beginning of the paragraph, and then press Tab.
To move a numbered or bulleted list paragraph up one list 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 for all list paragraphs at a given list level, use the option in the tab in the dialog. For an individual list paragraph, a tab can be copied and then pasted at the beginning of the list paragraph.