Unable to Disable/Enable "Prevent User Entered Asset Number" in Manage System Controls

Summary:

We had previously enabled the "Prevent User Entered Asset Number" checkbox in Manage System Controls and created a lookup to support this configuration. Now, we want to disable this setting and return to the original behavior where the system automatically assigns asset numbers based on the defined start and end values. Although we have deleted the lookup, the checkbox remains enabled, and we are unable to disable it from the frontend. Please advise if this can be reset from the backend or guide us on how to restore the previous configuration that allows automatic asset number generation. followed