FG2019.1.2, FL540, ground haze factor with standard value 1 :
... and calculated value 6.511 :
Example of the EarthView (without ALS, because with this feature activated, skydome is wildly blinking) - FL540 is not enough for nice rendering of the clouds and deep blue water :
This image looks like Concorde flying over some coast or islands, but under the plane is only deep water of the central Atlantic.
EarthView with ALS :
Much better result. For me, unusable, reason above. IMHO, standard terrain renderer with ALS is better than EarthView in case of the FL540.