The 3D Settings tab is available when editing chart styles for charts with three-dimensional subtypes. Pie, funnel, area, pareto, line, line/bar combo, gantt, and horizontal and vertical bar charts all have three-dimensional subtypes.
The Bar Depth % field lets you increase or decrease a chart’s default three-dimensional effect when it is first shown in a report. You can right-click and rotate three-dimensional charts shown in reports to change the default depth percentage and the extent of the three-dimensional effect.