Select Section Three Quarter on the Component panel of the ribbon and select a line, arc, segment, or a component. Two mutually perpendicular planes display. Each plane has a grey arrowhead on one face and a green one on the opposite face. The part of the model on the same face as the green glyph is sliced from the view. You can flip the arrowheads by clicking one of them.
The yellow circle is the section place modifier. To rotate the perpendicular planes for an alternate three quarter section, drag the yellow ball on the yellow circle. To adjust the depth of the perpendicular planes, drag the two yellow arrows.