If you mean switcher on Whisky UI it will have no effect when launch game with Heroic. Try to add library overrides for d3d10core, d3d11, dxgi in wine config to enable DXVK
open winecfg in the game settings and go to libraries menu in the new library to override type in what the previous message said (eg. d3d10core) click add you could edit the override by clicking edit and then choose the order