So you are looking for a way to protect your sensitive data in a folder, you don’t want the data read by anyone except you.
By default Windows does not include a mechanism to protect folders with a password, you will need 3rd party software to accomplish this some is a paid program and some are for free.
Below are free programs to protect folders
This program will hide your folder once you protect them after installation you will need to input your password and password recovery email
After inputting the password you can add the folder you want to protect, when status lock, it will protect and hide the folder.