If you need to remove the autocomplete on any form on checkout you need to overwrite the file that contains the form html and add the autocomplete=”off” attribute.

 

For example for the shipping address form you need to overwrite this file:

vendor/magento/module-checkout/view/frontend/web/template/shipping-address/form.html

 

And add the autocomplete=”off” attribute like this:

 

<form autocomplete=”off” class="form form-shipping-address" id="co-shipping-form" data-bind="attr: {'data-hasrequired': $t('* Required Fields')}">

 

Now the autocomplete functionality is disabled for all of the fields of the “co-shipping-form”.