How to generate the whole design as a single layer in CST?

I have a patch antenna, I need to take the whole design(patch and ground together) and export it to ADS, the problem is I couldn't able to take the patch and ground together but one by one meaning first the patch and then ground. Is there way to do to take as a whole? I watched a video on youtube, even the tutorial took the waveguide together with the solids. How so?

You have to select all of the components from the side menu. If you click on export while only one component selected it will only select that component.