The Visits Unallocated Widget surfaces how many Visits in the System, do not have Staff Allocated to them. Clicking the "View Unallocated" link, lands you on the Unallocated Visits Allocation Page.
This page allows you to Allocate to the Individual Jobs only. Select the Employee and Press the Allocate Button. The Search Button allows you to surface more information about the Visit in question.
If you find that there is a large amount of Visits for one particular site listed here. Like in the example above, you may need to allocate an employee to ALL the visit of that Visit Schedule. In this case Navigate to the Client, find the Site in Question and Allocate the Employee to the Individual Visit Schedules as required.