I am trying to plot the migration flow map.
I used a dual axis map to plot the place to move out, and the place to move in. Data looks like this.
I want to filter the corresponding 'Beforecode' by clicking the 'Current Code' on the map. Desirable result is like the plot below.
However, it seems that whenever I click the first layer, 'Current Code' on the map, the second layer becomes blurred. You have them on the map but they are not clear.
How should I approach the problem?
I really appreciate your help. The file is attached.