According to the Adobe documentation: “ColdFusion sets Cookie client variables to expire after approximately ten years.” Is there anyway to control that expiration at the server level, not the app level?

Cfcookie, for example.... https://helpx.adobe.com/coldfusion/cfml-reference/coldfusion-tags/tags-c/cfcookie.html

This IS the page I was quoting.

you can set the session cookie timeouts in CF administrator, if you set them to -1 for example it turns it into a browser session cookie. You can also add

this.sessioncookie.timeout = -1;

in your Application.cfc