Yep, FMod erase the style of Darker Nodes (and every other plugins), I already reported it here: FMODStudioEditor erase previously updated style · Issue #62 · fmod/ue4integration · GitHub
Thank you for your solution! I won’t update Darker Nodes as it’s not quite a proper solution (the proper way would be that the FMod plugin update themes correctly), but that might help other people having the issue!