I am using a Mac mini 2010 with MacOS Sierra 10.12.6.

Today, I deleted and re-created my Finder preferences after the originals became corrupted.

Clicking on Finder (the blue smiley-face square) within the Dock did not work unless I went to Open New Finder Window.

Is there a way within MacOS Sierra to get it to open automatically by clicking on the icon, like with other apps in Dock, such as Firefox or Terminal?

Any help is much appreciated.