To Select Elements Contained In or Overlapping a Polygonal Area
Select the Element Selection tool.
In the tool settings window, select the following icons: Method - Shape, and Mode - Add (+).
Enter a data point to define the first vertex of the polygonal shape. Use a left-right direction for inside selection and a right-left direction for overlap selection.
Press the <Shift> key while defining points to invert the current inside/overlap direction.
Continue entering data points until the polygonal shape contains or overlaps the elements you want to select.
Enter a final data point to close the polygonal shape.
Selecting Elements Contained In or Overlapping a Polygonal Area