What is Test Set Display For

In my Test Set the Execution Status is "not run", if I open one of the test cases in the Set it shows an execution status.

I noticed there is a Read Only Field in my test set Display For.

It is under the Releases Tab along with the Scheduled drop-down

Display For is set to an earlier release.  I'm thinking if that field points to the correct Release my test Set will correctly display testcase execution status