Nonprinting characters mode -- Enter sign

I copied text from a PDF file into Text Document. In the mode “Nonprinting characters” there are enter signs, but what I need is a sign that you get when you really press “Enter” at the end of a line.

To get rid of those enter signs I have to delete them and press Enter. Lot’s of work if you have many paragraphs in a document.

Is there a shorter solution to get rid of them, i.e. to replace them with “normal” nonprinting character that you get after pressing “enter”?

Kind regards,