Use the Workspace tab to specify the workspace of the primitive.

You can:
on the dialog.
to display the Position dialog.
,
, or
to open the Direction dialog.
,
, or
to open the Calculator dialog. Use the calculator to define the distance by which you want to twist the primitive.The default option is the centre of the base of the block. Other available options are shown below. All positions are relative to the default.

Top-left corner
Top edge, centre
Top-right corner
Right edge centre
Bottom-right, corner
Bottom edge, center
Bottom-left corner
Left edge, centre
OK — Accepts the changes and closes the dialog.