Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32n6/STM32N645/LTDC/LTDC_L1DCCR#0x0
LTDC layerx default color configuration register
default color blue
default color green
default color red
default color alpha
https://github.com/modm-io/cmsis-svd-stm32