App widget area resize and popup

Hi,

I would like to know if it is possible to set the App widget area size when we load the panel. I have seen the 'Flexible' Property in the Manifest File for responsiveness. Even though we have the option to resize, is it possible to set a fixed width for the app widget area when we load the iframe?

Also, Is it possible to create a popup outside the app widget area when we click on an item in the app content?