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:
