Is there a way to prevent my Science ship from coming home after getting kicked out of a system?

After mashing on buttons for a while, I figured out a way to do this, though it wasn't intuitive, and for all I know might not have worked until I was already out of their system of control.

Rather than hitting "Stop" or trying to tell it to Survey the system it was in, I instead needed to issue a new "Move" order. The new "Move" order overwrote the command to send it home.