To remove content from boxes select the boxes the content is to be removed from and then select Plug-Ins>GN4>Remove Content or the context menu GN4>Remove Content.

This will remove all images and empty all text from the selected shape.

Note that Remove Content will also remove content that is not in GN4 from the document.

Remove Content performed on a jumped text box will remove both the text content and the jump continued on/from box and content. If all parts of a jump have been removed then the Jump text will be delisted from the Jumps Tab.