Folder encryption

I used this tutorial to set a password for folders on my external drive: https://www.laptopmag.com/articles/password-protect-folder-windows-10 . But is there a way to undo this process? Any assistance is appreciated.

Can you please recommend a free basic folder locking tool that complies with these requirements? I'm using Windows 7U x64. 1. High level of security not needed. I don't care if the protected files/folders can be accessed from DOS, Linux, etc., or if the HDD is moved to another Windows machine...