When creating a new lead in Lightning, we were able to select the related campaign. This field is missing from Lightning. I see there is an idea for that: https://success.salesforce.com/ideaView?id=0873A000000CPmxQAG but with knowing Ideas status, I don't think this will ever get populated (so does the status of this idea).
So, how can we achieve this behavior? but still, use the OOB campaign field on the lead?