Set Length

By this context menu command the exact length of all line-shaped objects can be specified, such as roads, railways, line sources, and also of the vertical area source, etc.

First, enter the line-like object with its approximate length.
Then click this object under the Edit Mode using the right mouse button, and, from the context menu, select the command Set Length.

This results in the line-like object being extended beyond or cut off before the last entered point.