Can I pin things to the back screen of Xiaomi 17 Pro Max?

[Gardiel]

I'm using Xiaomi 17 Pro Max with OS3.0.315.0 xiaomi.eu. By default 17 Pro Max is supposed to have a feature where I can call up AI assistant mode, select something on my main screen and pin it to the back screen. But I can't find the function anywhere, the AI mode just calls up Google and shows no options for the highlighted zone.

Is the function just not supported on xiaomi.eu ROMs or is there something I have to enable for it?