User Remains Logged In After Browser Closes

Thank you for the reply, and sorry for my ignorance, but I'm having trouble getting it to drop sessions at browser close.

I tried adding $config['sess_expire_on_close'] = TRUE to the config file. That did not correct the issue.

Currently my sess_driver is 'files' (fresh install of ci). Does it need to be set to 'database'?

I guess I'm not completely sure what "set up correctly" means here.