You can easily copy a specific layer or the entire banner content from one banner to another!
Simply select all of the elements found in the banner using CTRL+CLICK or CLICK+DRAG to select the content and copy it to your clipboard ( CTRL+A / CTRL+C).
Then in the same tab create a new banner, select your desired size and once the canvas has loaded, hit CTRL+V on your keyboard to paste the layers.
Can I copy layers in the Generator?
This practice is not recommended while working on a Banner in the Generator because of the way the elements are sourced from the library, creating a high probability for the banner to crash due to a corrupted or improperly sourced layer.