Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32L4S9/GFXMMU/LUT1014L#0x0
Graphic MMU LUT entry 1014 low
Enable
First Valid Block
Last Valid Block
https://github.com/cmsis-svd/cmsis-svd-data