Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32MG1B/EFR32MG1B231F256GM32/GPIO/PE_OVTDIS#0x0
Over Voltage Disable for All Modes
Disable Over Voltage Capability
https://github.com/cmsis-svd/cmsis-svd-data