Thanks for the idea Wim!
I gave that a shot and set the layer line style to a very fat 3MM line but it still renders as a thin line.
How do I get the dimension line thicker after exploding, if layers-line settings does not effect this?
After exploding the dimension the arrow head becomes lines only and is not “color-filled”, plus the dimensions are no longer editable.
I think this should be part of Dimension Styles just as the size of arrowheads, text-size, and other visual dimension properties are set/adjusted.