There are no menu commands or keyboard shortcuts for toggling the case of selected text. Instead, you can place the Toggle Case icon
in your toolbar.
See this article for information on how to add an icon to your toolbar: Final Draft 7: How can I customize the toolbar?
NOTE: All support for Final Draft 7, including software activation, has been discontinued. You may find solutions to problems in the online knowledge base or in the PDF manual found on the installation CD.