OLED

Here are a few resources to get an SSD1306 OLED screen working with MicroPython code.

The examples use a Raspberry Pi Pico, but you can also hook it up to a Xiao RP2040 using the 3.3V pin, the GND pin, and SCK and SDA for I2C communication (see the Xiao RP2040 pinout from Adrián Torres).

Wokwi project

Svavar's OLED test

Electronoobs tutorial page