I have copied and pasted some text in a box. The cursor is stuck in the box. How do I get it out?

I’ve tried checking if it’s a table. It is not. I have deleted the text but the box remains, along with the cursor inside it. I can take the cursor out but it will only go above the box, so I can’t write any text below the box.

Please have a look at: What information should I include in a question in addition to OS and LibreOffice version? - #4 by ROSt53