to my knowledge you cannot
but maybe someone else knows a away. I have set a different way point to break away, but it does not go back to forward shooting
In the new Tower Beta that was released a week or 2 ago there is now an option to reset the ROI. After the ROI is set and you no longer need it, create a WP then select the WP options and at the very bottom you will see 'Reset ROI' to return to normal WP flying.