We can customize and set an address form for each country. This applies to entity billing and shipping addresses (e.g., show Address 3 and Address 4 in certain countries).
1. Navigate to Customisation > Forms > Address Forms.
2. Customise the Standard Address Form.
3. Rearrange and set the field properties (e.g., Show, Mandatory) as necessary.
4. Select the Country under the Country subtab.
5. Rename the form and set the corresponding field ID.
6. Click Save.