The Event Log view displays events from Yamcs Server. This could be on-board events, or events generated by Yamcs itself, whenever something significant occurs.
To load events for an earlier time range, select Import.
Clear your view by clicking Clear. You can always re-import events again at a later moment.
When Yamcs Studio becomes aware of a new event, it will automatically select and reveal it. You can prevent this default behaviour by toggling the Scroll Lock.