The jump range wavy line does not make it 100% clear if a star is in or out of range. Some other visual cue would be helpful
Select any random carrier, and hit shortcut key “W” for waypoint edit mode. Waypoint edit mode only allows you to click stars that are within HR from that star. A carrier can not jump beyond HR from any star. When finished with the experiment, click the small circle X to reset & test plan a different journey for that carrier.
Either click the square X or hit key “ESC” to exit waypoint edit mode with no saved changes.
Also, shortcut key “V” is the multi-point ruler, which can tell you the HR needed for a planned journey.