Although i've seen some similar treads, I don't manage to quite solve my problem. I've added a delimited text layer that includes coordinates of 2 points. I want to make arrows between these points that vary in size based on a fifth column value.
I created arrows by a geometry generator with the following expression:
make_line( make_point( "OR_Lon", "Or_Lat" ),make_point( "DES_Lon" , "DES_Lat" ))
After setting the symbology to 'graduated' i can change the colors based on the value, but the size is not working. Anyone an idea to fix this?