Default App request multiwindow but more similar to TouchWiz?

I already know there's an Xposed module for multiwindow but it lack a few features to get as polished as Samsung multiwindow. Mainly, the ability to maximize an app after this app has been put into dual view. I tried the multiwindow Xposed module an once an app has been put in dual view, you can't go back. The only way to go back to full view is too close and then reopen the app. Also, the Xposed module is still quite buggy...