Hi @mohammad_alqoqa , the only issue I’m aware of that blocks drag and drop from working is when running KNIME as an elevated (admin) user. There isn’t a setting that turns drag and drop on and off.
Can you confirm your KNIME is definitely not running elevated? Are you on Windows? If so, when you followed the steps to see if it was running elevated, what did you see? Can you post a screenshot?
For example, see screenshots of task manager here: