I've tried all types of calendar events, for just making a temporary one to recurring. I've never been able to get an option click menu with any event moving options displayed. I am, however, working with a standalone 2019 version on my Mac, and that appears to be different from some of the other installations described.
Also, after the various interim updates, things have changed. At one point it auto-changed me to the new version, I tried copying events with no luck so changed by to the old version, only to find that the calendar was completely empty. I managed to reload the previous version, regaining my calendar when I shifted to the old version.
After the next update, the switch back to the old version after the "auto change" to the new one retained the calendar events.
Later, it told me I wouldn't have any choice and would be shifted to the new version the next time I restarted Outlook with no option to switch to the old version. I guess they must have gotten a big response, because that was apparently never instituted. In fact, at the most recent update, it didn't force me temporarily to the new version as it had been. It left me in the old version.
I have no idea whether there is some logic to this sequence of events. At this point, I'm just happy to have the old version still available.