Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h5/STM32H523/ADC/ADC_OR#0x0
OP0=B_0x0
ADC option register
Option bit 0
0 (B_0x0): Vless thansub>DDCORE less than/sub>channel disabled
1 (B_0x1): Vless thansub>DDCORE less than/sub>channel enabled
https://github.com/modm-io/cmsis-svd-stm32