Hello there, @HollyT ...
You cannot change the "type" of page from one thing to another. For example, if you have created an "Assignment" for your course, you cannot change it from an "Assignment" to a "Page" or a "Discussion" ... while at the same time maintaining the content within. As you've correctly indicated, you will need to make a brand new page of whatever "type" you need...and then copy/paste the contents from the existing page to your new page...whether it is a new "Page", "Assignment", "Discussion", "Quiz", etc.
Hope this helps a bit. Let Community members know if you have any other questions about this...thanks! Take care, stay safe, and be well.
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