In the Notes 8.x Standard client, the twistie icons for section titles are almost invisible for certain section border styles (Gradient, Tab Diagonal, etc.).
In the Notes 6.5 client, the twisties were displayed to the left of the section title with the same color as the border color for the default ...
when you select as a column property:
- show twistie when rows is expandable
and you use a formula similar like:
Category + "\\" + SubCategories
Only the first row is displayed with the provided image, the second row becomes again the ugly duck twistie as ...