How do I ungroup words?

When I am reading, it is easy to group several words: click on the leftmost, shift-click on the rightmost. How do I remove this grouping? I can’t figure out how. I want each word to be a separate word, like before.

You can still just click and select separate words in your saved phrase. No matter if you highlighted and saved a phrase, each individual word in it is still clickable and you can create LingQs of them.