Linked below is a displayio sample program by Liz Clark based on Arduino code by Phil Burgess. It shows how to use certain display functions and methods on a DVI display.

The code is clever in seeing what displays may be connected by:

1. Testing if board.DISPLAY exists
2. Seeing if a DVI Adafruit board is being used
3. Then assuming a Raspberry Pi Pico is being used

Then various text and graphics are displayed. It uses many displayio functions and libraries and can be used to see what capabilities are available.

Also this guide is recommended for an introduction to displayio: