The File menu allows you to close the program.

File menu
Monitor a Process...
displays the process chooser to allow you to choose which process to monitor.
File menu
Stop Monitoring
stops monitoring the process and clears the display.
File menu
Load Wait Chain Information...
loads wait chain information from a file and displays it.
File menu
Save Wait Chain Information...
save wait chain information to a file.
This can be useful for saving wait chain information for diagnosis at a later time, and for diagnosis by a colleague.
File menu
Exit
closes Thread Wait Chain Inspector