You can use Spotlight to quickly find Disk Utility or go to Applications -> Utilities -> Disk Utility. Right click on folder, and choose Get Info and note the size of its contents, this will be very important in following steps. See You can also password-protect document inside of apps such as Pages, Numbers, Keynote, Microsoft Word, etc. Create a new folder and add files that you wish to lock into this folder. You can also create a password protected disk image. You can put them in an encrypted zip file. Files and folders on iCloud drive are still just files and folders. If you still think you need to put another layer of protection on those files, like maybe you have an assistant that also has access to your iCloud password, then you can do the same things you do with any files.

So think about how anyone else would get to see any of your files in iCloud Drive. Select File from the menu bar and hover over to the New Image. In the Finder, Choose Go > Utilities, and double-click the Disk Utility icon to open it. Create a new folder and move the important items into it. You can see them on your Mac with your user account password and your iOS devices in the Files app, but that is protected by your passcode and/or Touch ID or Face ID. Here are the detailed steps on how to password protect a folder on my Mac.

To open the folder again, all you have to do is click on the. At this point, you won’t see a locked folder on your screen. There's no way for Apple to read them and no way for anyone else to get to them without your iCloud password. Type Y into the screen and press Enter to lock the folder. Your files in iCloud Drive are already encrypted.

How to lock a folder mac