Answer
To exit an autorun application on the BL654 dongle, navigate to the "Config" tab and select "BL654 USB Dongle - Exit autorun" from the options at the top of the page (see below). This will enable you to put the dongle back into Interactive Command Mode while an autorun application is loaded to the dongle.
This option is only available in the SSL version of UwTerminalX. If you do not see this option, please download the SSL version of UwTerminalX which can be found on Github. https://github.com/LairdCP/UwTerminalX/releases