I know this is an old post, but just in case someone else has the same problem, you can create an UI Action, to remove the sysparm_referring_url parameter from the URL, which causes related lists not to show, and redirect to this new url.

Like that you will have a kind of on-demand related lists.

var url = new GlideURL(location.href);


url.deleteParam("sysparm_referring_url");


location.href = url.getURL();