I am playing classic cabal online on a private server, there is no setting to
remove the effect of Force Towers in nation war/mission war/mwar, also I do
not know if this setting is even available or implemented in the official
servers.
Why you should remove this effect
For better visibility. The effects from force towers sometimes can prevent you
from seeing the enemies. Also, this effect is annoying. It is even worse if
there are so many force towers built around.
To remove, navigate to your cabal "EFX" folder. The path should look
like this:
Cabal Online\Data\FX\EFX
(Cabal Online > Data > FX > EFX)
Inside the EFX folder, you will see a folder named "forcetower".
Move the forcetower folder to somewhere else. For me, I just create a
new folder in the same location and name it anything like shown in the picture
below. Then I move the forcetower folder into the new folder.
Note: You must reopen cabal to apply this change or close cabal before doing
this.