Important: If you have an error or white screen after updating Elementor, please see here for the solution: http://bit.ly/2KRhmLQ

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Hide comments section "You may use these HTML tags".

This is from WordPress, you can edit the template file directly (please use a child theme) or you can hide it by putting the following under theme options / general / custom css:

p.form-allowed-tags {
    display: none;
}

Template file is: templates/comments.php

Also, if you are looking to disable comments on pages or posts please refer to this article.

http://www.cryoutcreations.eu/wordpress-themes/wordpress-tutorials/wordpress-disable-comments-tutorial

Cheers!