First, we need to be clear whether you are talking about the “away“ which is part of the “location mode“ or the “away” which is part of the smart home monitor “security mode.“ These are actually two completely different things. ( in the classic app, “security mode“ was called “armed state.“) See the following:
In the classic app, you can use Geopresence to change both the location mode and the security mode.
In the new app, there is no way to automate the change in the security mode except by time of day. You cannot use Geopresence to arm or disarm smart home monitor in the new app.
Also, for those who are using both apps, smart home monitor in the classic app and smart home monitor in the new app or actually two completely separate features that just happened to have the same name. If you arm or disarm in the classic app it does not The smart home monitor settings that you can get to from the new app and vice a versa.
Your post mixes terms From location mode and security mode so I’m not exactly sure which one you were trying to describe.
I believe you can change the location mode with Geopresence in the new app, but that will not affect the security mode in the new app in any way. And you cannot change the security mode in the new app with Geopresence. 