Using the example mission in this thread. He could have replaced WP1, which appears as an orbit in his example, and added a WP prior to WPOrbit. I would place WP1 so that it can enter and exit the Orbit facing ROI2. So WP1 should have a bisecting line through the Orbit pointing at ROI2. As it was, he was entering and exited the orbit with the drone facing away from ROI2, which would give expected results.
Again this is a work around within Tower and may have not been what he intended for his video. Mission Planner has finer controls and more options, which should be used for more complex missions. I'm not familiar enough with Solex, but it now offers an addon for mission planning as well. I think it offers finer controls like MP, but you'd need to confirm.