I would like to set this as the default behavior for captions (text boxes).
Currently, I can only set this default behavior for text boxes, but not for
captions which happen to be text boxes.
In other words, selecting No Line on a caption text box and then
right-clicking and choosing Set AutoShape Defaults doesn't work? (Note that
this affects the current document only.)
I can't see why a caption text box would have a border to begin with. It
doesn't on my system (never has). Are you sure the Caption style has not had
a border added (Format | Borders and Shading)?
Right click the caption, click "format text box", click the "Colors and
Lines" tab. The line color controls this. I want the "fill" "color" set to
"no fill", and the "line" "color" set to "no line", by default.
I have done that. Do you think I answer without testing? I am telling you
that on my system I get a text box with no line and no fill. If you cannot
get this to work (and I still can't imagine why it doesn't), then perhaps
you might insert the graphic and caption inline, select both, and insert in
a frame.