In MacOS, you don’t need a third-party program to set a password on a folder. The system allows you to create a so-called folder image, which is an encrypted copy of the folder. All files that are stored inside this image are under password protection.
To create an image:
- Open the Disk Utility application (easy to find via a search).
- Go to “File” → “New image” → “Image from folder” and specify the path to the folder you want to password protect.
- Set the name and save location of the image. Choose 128-bit or 256-bit encryption and make up a password.
- Set the format to “read/write” and click “Save”.
Now you can delete the original folder and use the protected image. When you open it, you will need to enter the password, and then the image folder will appear and be available in the Finder until you click the “Eject” button on the side menu.