You can remove a settled account by requesting that the credit bureau do so. You do this by sending them a letter of dispute. Its removal will improve your credit score.
Whether or not they’ll remove it varies according to the situation. In most cases, they will not remove it. However, if you can prove the information is incorrect, they will probably remove it. The update should take effect within 60 working days.
Settled accounts affect your credit report for up to 7 years.