Found in FSdemo, reproduced in 1.3m1.
There does not appear to be any way to actually add cases or groups to a Study. Studies cannot be added from any patient case page, nor from any Group page, either. This means that the "Studies" property of groups will always show the "No matching studies" message, making the property useless.
The "Patient Form Configuration" Studies setting is fully functional, but is also rendered useless by the fact that cases cannot actually be created from within the study page.
There is no way to view Studies from within Phenotips except by first attempting to manage them as an Administrator. If this feature is meant to be usable, there should be some way for the user to navigate to it from the homepage, which the top bar implies is possible (see attached screenshot.)
Navigating to Studies:
Administration > PhenoTips > Studies. From here, create a new study or click on an existing one, and then navigate backwards from the top bar.