can i remove usb after efi boot?
currently using mbp13 2018 with sonnet egfx 550 + rx580
i use usb efi booting to use in bootcamp windows.
however, i want to know whether it is possible for me to remove the usb(with efi files) after i login to the windows.
Yes you can. It's only needed at pre-boot and booting. Alternatively you can create an internal partition of 32MB FAT for automate-eGPU EFI.