For some interactive measurement functions, you can display auxiliary lines.
Example: For the Arbitrary Line 
measurement function, the auxiliary lines are, for example, vertical to the distance to be measured and help you to exactly align this distance to be measured to a structure in the image.
For existing measurement objects you can conceal or display these auxiliary lines at any time and can alter their length. To do that, select the line measured in the image and click your right mouse button to open a context menu. Select one of the commands in the Helper Lines menu.
The context menu's commands
Select the Helper Lines > None command to switch off the display of the auxiliary lines for the selected measurement object. You can re-enable their display at any time.
Select the Helper Lines > Short command to shorten the auxiliary lines for the selected measurement object. If there are a lot of measurement objects in the image, the display will become a lot clearer.
Select the Helper Lines > Long command to have the auxiliary lines for the selected measurement object run over the entire image.
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