I don't think I fully understand what you are trying to do but, having tested out RH 2019 and having found that many, many features are missing compared to RH 2017, my only advice is to not try to upgrade now. Wait until a few patches are released and try again.
It may help to understand that 2019 was a complete re-write using completely different tools to build it. I'm told by Adobe that this will ultimately offer the development team to be much faster with improvements down the road. But for the moment, we see some hiccups. Such as this inability.
Note that the feature wasn't "taken away". What has happened here is that it's not had the chance to be built back into what they have at this point. I understand they are working frantically to make 2019 fully featured. So Ioana_St's advice is sound. You likely need to wait for a while before considering 2019 to be ready for prime time.