Magento – Duplicate Street Address: Line 1 Label : Magento 2.3.2

You have to remove the required-class from each of this field.you can you jquery

jQuery(document).ready(function(){
    jQuery('#billing\\:street1').removeClass('required-entry');
    jQuery('#billing\\:city').removeClass('required-entry');
    jQuery('#billing\\:country_id').removeClass('required-entry');
    jQuery('#billing\\:country_id').removeClass('validate-select');
}

in the billing.phtml from checkout/onepage/

For street address,you need do some coding.

At checkout, the fields are rendered from Magento\Checkout\Block\Checkout\AttributeMerger.

As for showing placeholder for street , go to the function getMultilineFieldConfig, and paste:

if($attributeCode=='street') {
    $line['label'] = $attributeConfig['label'];
}

After

if ($isFirstLine && isset($attributeConfig['default']) && $attributeConfig['default'] != null) {
        $line['value'] = $attributeConfig['default'];
}

And see that magic. I have already tried it with a magento 2 instance, and it is working.