Hello Guest,
Why do you want to make the filed as optional, for countries like US; Canada, Brazil, the filed needs to be updated.
If the Tax Jurisdiction code is not relevant to your country, check the tax jurisdiction procedure defined in country global settings.
Check if this value is maintained at the following path.
go to SPRO --> Tax in Sales & Purchases --> Basic settings --> tax Jurisdictions --> Define structure for tax jurisdiction codes
If the value is maintained here, Tax jurisdiction code is considered. Remove the value from Country setting if the tax procedure is used by other countries.
BR
Amitash