1. Double-click the Measure Items folder in view explorer.
2. In the Properties window, change the Time Range property as desired:
Change to "No" if you want to disable time range capabilities with respect to measure items. If your view already has measure items in it, you will be prompted to confirm the change. If you click OK, all existing measure items will be removed from the view.
Change to "Yes" if you want to enable time range capabilities with respect to measure items. If your view already has measure items and hierarchies in it, you will be prompted to confirm the change. If you click OK, all existing measure items, time hierarchies, and parameters based on time hierarchies will be removed from the view.
See also: What Happened to a Measure Item that Used to be in my View? and What Happened to a Hierarchy that Used to be in my View?