Stacked Bar Charts

To select bar / column charts, you select Bars in the menu. To create a column chart switch the orientation to Time.

Stacking Values

The stacked bar charts stacks measures on top of each other. When in Stack Mode, the dimension in the Stack / Column field is used to create a segment for each combination of measure and member.

One measure stacked by Size - Power BI theme applied

Grouping

When you are selecting Column Mode you get bar charts grouped in columns by the Stack / Columns dimension.

Two measures grouped by Size

Expanding

When you expand a node in a stacked bar chart, the sub categories are shown in place: