Here's how to do it:
- Go to the Dropbox website and sign in to your account.
- Navigate to the shared folder you want to unshare.
- Click on the three dots.
- Select "Manage permissions."
- Click on the option next to the name then select "Remove" from the dropdown menu.
- Confirm the action if prompted.
- After unsharing, the removed users will no longer have access to the folder.