How config user session time out for Gateway web page?

I want to know how can I config user session time out for Ignition Gateway web page? (not perspective only gateway page)

{installDirectory}\webserver\webdefault.xml should have a line for <session-timeout>30</session-timeout> - specified in minutes.


But strangely the session didn’t end even after 30 minutes.
Shouldn’t it end current open session if user doesn’t do any activity?

Based on what I’ve seen, I’d guess it only times out with no communication and pages with live values keep the session active.