Adjusting the position of a VFX - 0ceal0t/Dalamud-VFXEditor GitHub Wiki
In order to change the position, rotation, or scale of a VFX, first find all of the "root" emitters. These are the emitters which spawn the particles which make up the VFX itself. To do so, find the timeline which creates emitters.
Then, find each of these emitters in the "Emitters" tab, navigate to "Animation," and adjust whichever parameters you want.