The README.TXT usually lives in the top level project directories, explaining usage, etc
Current code is supposed to auto-detect screen
STM32Cube_FW_F7_V1.17.0\Projects\STM32F769I-Discovery\Examples\JPEG\JPEG_DecodingUsingFs_DMA\readme.txt
Pretty sure you can find references in the code to USE_LCD_HDMI, grep..
The boards without the screen was an actual product
https://www.mouser.com/ProductDetail/STMicroelectronics/STM32F769I-DISC1?qs=Gd3Cm49KlLOyGb2v7%2Fjr6Q%3D%3D
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