Session timeout and user inactivity timeout are two different settings. - https://community.acumatica.com/maintenance-and-troubleshooting-229/how-to-extend-the-session-timeout-3933?postid=90543#post90543
Session timeout is set to 1h by default in the web.config file.
When a user has exceeded the session timeout, they may not be aware.
Can there be a warning message or pop up message informing them so they are aware they on a “stale” screen?