There are lot’s video regarding to live composer, you can get help from that video. We had gone through you site and found that there is another button on footer which is rendering menu button. This might happen if you had added those code or third party plugin is adding on footer. Please check by deactivating plugin or see the setting from page builder. Here is the code which is causing the issue: <button id="responsive-menu-button" class="responsive-menu-button responsive-menu-accessible responsive-menu-boring" type="button" aria-label="Menu"><span class="responsive-menu-box"><span class="responsive-menu-inner"></span></span></button>
We request to consult to respective author if you are having issue other than our theme, so they can guide you on better way.