Firstly, our team has checked your app and found that you id of the element you whant to make full screen was placed on the page where you are using the reusable. We made a few minor changes, specificaly the id was assigned in the page of the reusable. So now the element is extending to full screen size.
Regarding focus/floating groups, we already posted the updated version of the plugin so you will be able to use the plugin on this type of element. Please update the plugin to the latest version to have it working properly.