The "Keep me logged in" option is built into the template. Because this option is hard coded into the event, there is no configuration to disable/enable this link when editing the event in Luminate Online. It may be possible, through the use of HTML/CSS/Javascript to hide it from displaying, but Support would not be able to provide that code or assist with a customization of this nature. If you would like to pursue the route of engaging Professional Services for a Scope of Project with help in hiding the Keep me logged in option, please contact Support and reference this article.