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Yes, I found it!!!!
In the Toolpsace->Settings tab, Surface->Table Styles->Elevation, right-click on the currend default style ("Standard") -> "Replace with..."
In the next window you can pick the legend-style you want and make it de default-style
I was looking for this a long time ago, the actual place it is set is within each surface style, rather than doing a find and replace (albeit that would be quicked);
I have a default surface style for cut & fills that is set within the template and the table style is associated to this
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