Session timeouts in QlikView or Qlik Sense are not the only reasons for sessions being terminated. Individual browsers have their own timeout settings.
When it comes to timeout it, the timeout for each browser should be checked too.
Here are links to the common browser, please make sure to check this before doing changes. These are recommendations for third party software configurations and cannot be directly supported by Qlik Support.
For more details around how to configure individual browser components, please contact the respective vendor.
Google Chrome does not allow the configuration of timeout settings.