How do I Undo or Delete a Highlight

JCJN

While doing some reading this morning, I chose to do some highlighting.  (What a great feature!)  It was the first time I had used this function and was experimenting.  I placed a couple of hightlight over the same selection.  Now I want to delete the highlighting!  How do I do that?  I have read the post and tried the CLT+SHIFT+K without success.  Can you help?  

Jim

B. J. Clarke

If I'm not mistaken, on a Mac it should be Command (CMD) +SHIFT+K. At least, this combo has worked for me.