You can remove those pesky automatic related videos from all YouTube videos by using the code here and entering it into:
Options > Integration > Head Code
<script type="text/javascript"> (function($) { $(window).load(function() { $('.fluid-width-video-wrapper').each(function() { var src = $(this).find('iframe').attr('src'); $(this).find('iframe').attr('src', src + '&rel=0&modestbranding=1&autoplay=0&showinfo=0&controls=2&iv_load_policy=3'); }); }); })(jQuery); </script> // Remove the // comment tags preceeding <script> and </script> after pasting code in the proper Divi settings area. // YouTube Parameters // "rel=0" Removes related videos at end // "modestbranding=1" Remove YT logo from control bar // "autoplay=0" Disable autoplay, =1 to Enable // "showinfo=0" Strips video title // "controls=2" Show player controls // "iv_load_policy=3" Removes video annotations // "color=red" Not listed in above code. Changes the progress bar color. ONLY 'red' or 'white' values are currently available. // Personalized watermark will only show when 'modestbranding' is not enabled and 'iv_load_policy' values is removed.
Find the full code link: codepen.io/vextris/pen/remxyQ
Look through more information about this code: divi.tutsdirectory.com/listing/how-to-remove-youtube-related-videos-in-divi