Universal control and VoiceOver

Hello every body, I've updated macOS 12 and iPadOS 15 to the firth beta released this week, and in the release notes is written that universal control is now available. I own an M1 MacBook Air and an 8th generation iPad and I use VoiceOver on my Mac, since I'm totally blind. I noticed that Universal control is not working yet. I don't understand how I should activate the feature. I tried to drag my finger to the right side of the trackpad, since my iPad is at the right of my Mac, several times. I tried to move my iPad to the left and drag the finger to the left, several times, but there's no way to activate the connection between the 2 devices. Did some of you successfully activate the feature? If yes, can you explain how to activate it? Thanks so much!