I’ll never understand why people wish to spend so much time outside their cosy, comfortable boxes … If the box is too small, just make it bigger instead of jumping out of it completely. It’s cold out there 😉
I’m not sure if I understand correctly what you’re trying to achieve. For a Drag & Drop question, you definitely need an image to drop the items on. But you can use a transparent PNG to keep all the rest editable in Lectora.