Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32n6/STM32N645/GFXMMU/GFXMMU_LUT466L#0x0
EN=B_0x0
GFXMMU LUT entry 466 low
Enable
0 (B_0x0): Line is disabled (no MMU evaluation is performed)
1 (B_0x1): Line is enabled (MMU evaluation is performed)
First valid block
Last valid block
https://github.com/modm-io/cmsis-svd-stm32