To Apply a Clip Volume by Polygon

Select the Apply or Modify Clip Volume view control.
In the tool settings, click the Apply Clip Volume By Polygon icon.
Enter data points to define vertices of the polygon.
When all vertices are defined, click the Close button to close the polygon.
If only one view is open, then the clip volume is applied.
If more than one view is open, enter a data point in the view to which clipping is required.