On MY Teams page you will scroll down to view “Edit Your Team Configuration”. This is where the Owners only can change global account features for all users.
Owners of the Team can check or uncheck at anytime to disable or enable depending on your subscription plan. If you make any changes remember to click Save Team Configuration.
When Inactivity Session Timeout is disabled, then this means each user has the ability to set their own timeout (see pic)
To Enable, Owner will need to click on the down arrow to choose the timeout time which will then set the session timeout for ALL users under this Team.