I checked baseline metrics in a view and clicked save. The view doesn't look any different and when I re-edit the view the box is unchecked.
The Baseline metrics box enables the baseline metrics to be chosen from the metric picker.
Checking the box does not do anything other than that.
Release : 3.7
Component : IM Reporting / Admin / Configuration
Check the baseline metrics box when configuring the view and add a baseline metric to the view.