Left-click, drag the mouse inside the work area to set the length and angle of the line and, finally, release the mouse button.
Click inside the work area, move the mouse to set the length and angle and, finally, click again to finish.
To draw a horizontal, vertical, or corner-bound line (defined in the page properties), hold down the [SHIFT] key during creation.
To draw consecutive lines click twice on the tool and activate the "consecutive lines" mode in the instrument dialogue window.
Press the [ESC] key to exit the drawing action.