To create a single line:
As you enter positions, a rubber band is displayed from the start position of a new line to the current cursor position.
The angle and length of the line from the horizontal are also shown , depending on whether gridding is selected on the Options dialog.
These values change as you move the cursor.
When the end position of a line is entered, the rubber band disappears. It is displayed if you enter the start position of a new line.