In both RSVP and Ticketed Calendar Events, 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 an reference this article.