3.12 OLED SSD1322 and LVGL not working on Wemos D1 mini ESP32

the OLED drivers treat any colour other than pure black as white. So try this:

lvgl:
  bg_color: black
  widgets:
  - label:
      align: center
      text_font: roboto10
      text: Hello World!
      text_color: white
font:
  - file: gfonts://Roboto
    id: roboto10
    size: 20
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