Switching From Legacy Builder to New Builder Need Advice

Hi everyone I created an app a while ago on adalo in the legacy builder and I have been wanting to move my app to the new editor version so I can take advantage of the video feature that is not available in the legacy builder. However I am running into an issue with the new builder when it comes to my menu. In legacy builder I am able to lock the three button on the bottom right hand side to the bottom of the screen (Close, Notifications, and Messages).

Now in the new builder I am not able to lock these three icons to the bottom of the screen. I can’t find the sticky option. For some reason it won’t let me use that feature on these objects. Some devices the blue does not go all the way down the full screen like it use to either. I need some advice on this.

Here a photo showing what it looks like on a device and how its comes up short.