A family of Microsoft word processing software products for creating web, email, and print documents.
Your observation is correct - there is no traditional close button [✖️] on the title bar of the Footnotes Pane, itself. However, you have at least 3 alternatives;
- Go to View> Footnotes to clear the check, or
- Use the Show Notes button on the References tab of the Ribbon to toggle the Pane On/Off, or
- Assign a keyboard shortcut to the ViewFootnoteArea command to toggle the Pane.