New Alert UI - multiple ACK

Hi all.  I searched but haven't found an answer.

In the new Alerts UI the "Add ACK" seems to be missing (at least for me).  I've tried Firefox 83.0 (64-bit) and Chrome Version 87.0.4280.88 (Official Build) (64-bit) on Win10).

The documentation shows it -
https://www.logicmonitor.com/support/alerts/about-alerts/alerts-page-overview/#multiple

If I view the alerts in the old UI, there is still the option to check several alerts and click the Acknowledge button.

What am I missing??

 

Thanks!