Blueprint editor uses iGPU instead of external GPU

Development Programming & Scripting Blueprint
1

Hi! I am facing a weird issue where the blueprint editor is very slow and laggy and uses only the iGPU (at 100% utilization) instead of the external GPU (which is lightly utilized). The blueprint viewport has the same issue. On the other hand, the level editor works just fine and utilizes the external GPU at 80+%.

Version: UE 5.1
System:
CPU: 6-core Intel i5-11400H
32GB RAM
fast 1TB SSD
GPU: Nvidia 3060 in external thunderbolt GPU enclosure
OS: Windows 11

I have set UE to use the external GPU both via Windows settings and via the Nvidia control panel.