Unset custom field

Hi,

This plugin works perfectly. Big thanks to The Author.

I have created custom billing field using this plugin,
but now I have some conditional login, when I need to unset this field using filter ‘woocommerce_checkout_fields’,

I am trying to go with

unset($fields[‘billing’][‘myfield6’]);

but it is not working for custom field,

I can only unset default WooCommerce fields using this method.

Would be really appriciate for any idea how to do that.

Thank you