You can modify the board outline by RMB "Select Board Outline". Then you can use the graphics tools to make the modifications.
You can delete the board outline by RMB "Select Board Outline". Then you select the board outline (it's easiest to draw a rectangle that intersects part of it) and then use Backspace key, Delete key, Ctrl-X, etc.
It is not necessary to have a board outline as part of your startup file or design template.
Oh Boy, I wasn't paying attention, thanks very much, totally forgot about the select list, picked "Select Anything" figured it would do it and just forgot to look down a little further on the list.
Tough Day! Thanks
You can also import board outlines from a DXF file. Check support net for how to do this; if you can't find it I can dig up the notes.