Renaming one at a time
Change the text directly on a divider slide and press refresh to update your Contents page. Don't edit the names from the contents page as it will be overwritten by what is used on the divider slide.
Renaming several sections or subsections simultaneously
- Launch the Outline pane
- Right click the section you want to rename
- Click Rename
For the change of name to appear in the presentation, you will then need to click Refresh.