Nailed it! Thanks Dimitry, appreciate your help!
Hi there I've changed the default black connector to another colour and weight (to see it better on the Dark theme) but I find that it doesn't appear in the new look when I open a new map (or add connectors in an existing map). I did this via Tools>Settings>Defaults>(changed Connectors settings as permitted) then Save (as DVP.freeplaneoptions). Then I "Load" DVP.freeplaneoptions but the original default connector style is presented. I also closed and restarted FP just in case. Any other suggestions?...