Xfinity Streaming App: Access To Full Guide While Watching Live TV

This might be a feature request or inquiry, so my apologies if it needs to go somewhere else. In the X1 box I have at the house, I am able to access the full guide while whatever I am watching on live TV is playing in the background.  That feature does not appear to be available with the streaming app with the live TV option, and all I have access to without stopping whatever I am watching is the mini guide. Is that a feature that can be added to the app, or is the app not built to support such a feature? I am using the Xfinity streaming app on a Roku device.