Sample Scenario: On adding few workstations to the domain, the workstations will be discovered the next day as the product scans the domain controller only once a day, unless you click on Reload objects manually.
If you prefer to add the newly added devices immediately, you can manually reload the domain objects from the EventLog Analyzer UI, after adding the devices to the domain.
To reload the Domain Objects manually:
Go to Settings -> Admin Settings -> Domains and Workgroups -> Choose the respective domain -> Click on the Reload objects icon next to the edit icon -> Choose the objects and click on Reload.
Sample Screenshot: