TinyUSB is Awesome! And tutorial about how to use it in SAMD21 board
Unlike the Arduino Uno and Arduino Nano, the Seeeduino XIAO onboard USB is not supported
XIAO
Use Seeeduino XIAO in Kicad PCB design like a components
The half-hole design of Seeeduino XIAO is for soldering directly on the PCB, no connectors