I have a line tracing that I've made which I'd like to label as a river. I've done this already with other line tracing rivers on my map but I can't remember how it's done. The properly labelled rivers have an attribute table with the ObjectID, Shape, Shape_Length, and Name. I can only manage to manually add the Name column and can't see how to add the Shape_Length, which I recall as being important to how the name gets placed. The expression under Labelling Properties reads $feature.Name. How do can I make my river label appear? Thanks