PlatformIO:
1. Find board json file under C:\Users\username\.platformio\platforms\atmelavr\boards\,
2. Change usb_product value.
C:\Users\username\.platformio\platforms\atmelavr\boards\micro.json
"usb_product": "Your device name",
Arduino IDE:
1. Find boards.txt under
C:\Users\username\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3
2. Find board name ex. Arduino Micro
3. Change micro.build.usb_product value
#micro.build.usb_product="Arduino Micro"
micro.build.usb_product="Your device name"