The CSV header is the row that contains your columns name
In some case you want to export your data without the header.
There is an option for that in lembot.
Choose keep header or remove header while creating a bot.
In this demo, I use this feature to append an export to another.
☝️ if you actually want to export several campaigns at once, in the same sheet, there is a feature just for that, it's called megabot. See how to ↗️.