If you have shared a link to an album, then you can unshare it if you want to. To unshare a link to an album, sign in to your Dropbox account. Once you have signed in to your account, click "Photos" tab located at the left sidebar. Click "View all albums" and browse the album which you want to unshare. Right-click the album and select "Unshare album" option from the pop-up menu. A pop-up window opens up. Click "Unshare" button and confirm your choice. You have another option to unshare link to an album on Dropbox i.e go to "Links" page. Browse the album and click "Unshare album" button. If you unshare the link, then it will no longer work. Only you will be able to view the album, and the recipients will get an error message.