How remove hyperlinks?

How do I remove a hyperlink?

As the question is ambiguous, perhaps this link may help, https://www.google.com/search?q=libreoffice+remove+hyperlinks

Welcome!
However, please try to be more precise when wording questions and their (short) subjects/titles.
In this case (e.g.) the subject may suggest you want to remove all the hyperlinks occurring in the document, while the body of the question (even shorter) is about a single hyperlink without telling what kind of hyperlink that is.
Yes, there are different kinds, and some are treated not exactly consistently.
Kinds of hyperlinks in Calc documents.

  • Inserted into cell texts as textfield.URL objects (looking like formatted text portions).
  • Inserted into shape texts.
  • Assigned directly to graphical objects or cells.
  • Some users include links to external data.

Strangely hyperlinks of the first kind can be removed as a side-effect of removing all direct formatting from the cell (Ctrl+M).