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I have QGIS 3.8.2 installed and started to look at the Geometry Generator. I have a layer of airline tracks and trying to create a curved line linking start and end points.

I did a lot of searching and found the followng code but when I apply this I get straight lines not curved lines like I have seen elsewhere.

make_line( start_point($geometry), centroid( offset_curve( $geometry, length($geometry)/-5.0 ) ), end_point($geometry) )

Hopefully its something simple that I am doing wrong.

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To visualize them as curved lines, change the Symbol layer type to Arrow, then select Curved arrows option.

Head length/thickness should be zero as you would not need arrow-heads.

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