Navigate to the Test Coverage primary tab, and then to the Builds secondary tab. In the details window of the specific build, you can view all the test sessions for the build by clicking on the test sessions icon in the right side vertical menu. This will expand to show the list of test sessions for the build, if any. If there is a purple numbered box below the test sessions icon, that indicates the number of test sessions for the build.
Users will need view permissions in the test coverage module to perform this action. Depending on the settings of a users project permissions, users may be able to view all project builds or just a subset of them. Project owners manage the permissions for project members.