When viewing a large number of events in the VCO, such as 6 months worth of event history for all edges, 1.1 million events in this example, then selecting the max option for "Objects per page" in the lower-right corner, it looks as if it's displaying all events. However when you scroll through the page of events or export them, you won't see nearly as many events as it says are displayed and may only see a few days worth of events, or more depending on how specific your filters are.
In addition, the button to go to the next page of events will be available, and as you click it, the number of events show abnormal numbers, indicating it's showing more events than the total:
VECO version 6.0.0.x
Regarding the limited number of events seen when trying to view or export a large number of events. When exporting events, there is a limit if 2048, which is also why you won't see all 1.1 million events in one page even when selecting that option. This is VECO-wide setting to help limit how many events can be queried at once. We would recommend filtering down to specific edges, events, or time-frames to limit the number of events to export.
Regarding the number of events displayed in the lower-right corner of the Events page. This was identified as a software defect, ID 155037, and will be fixed in VECO release 6.4.0.0.