How to remove fields if one doesn't want all under payments tab for bank details.

We have filters for it.

Add below code to functions.php of child theme.

// single field
add_filter( 'wpj_payments_display_' . 'bank_bank_address' . '_field', function() {
	return false;
});
// multiple fields
add_filter( 'wpj_payments_display_' . 'bank_bank_name' . '_field', 'wpj_hide_bank_details_child' );
add_filter( 'wpj_payments_display_' . 'bank_bank_address' . '_field', 'wpj_hide_bank_details_child' );
add_filter( 'wpj_payments_display_' . 'bank_account_name' . '_field', 'wpj_hide_bank_details_child' );
add_filter( 'wpj_payments_display_' . 'bank_account_number' . '_field', 'wpj_hide_bank_details_child' );
add_filter( 'wpj_payments_display_' . 'bank_account_currency' . '_field', 'wpj_hide_bank_details_child' );
add_filter( 'wpj_payments_display_' . 'bank_additional_info' . '_field', 'wpj_hide_bank_details_child' );

function wpj_hide_bank_details_child() {
	return false;
}