f you have an internal discrete NVIDIA GPU (dGPU), the discrete GPU driver was designed to switch between the Intel integrated GPU & the NVIDIA dGPU, and does not support NVIDIA external GPUs. (If you are using an AMD Radeon eGPU, you will not have this issue.)
There are a couple of potential solutions:
1. If you are using an NVIDIA eGPU, then you can just disable the NVIDIA dGPU. In Device Manager->Display adapters, right click on the dGPU and select disable.
2. You can uninstall the dGPU driver and install the eGPU driver that will support both the external GPU and discrete GPU.
a. Download and run the latest Driver Display Uninstaller from Wagnardsoft.
b. Install the latest NVIDIA desktop driver for the GeForce GTX 10 series card.