How to put Enter after each line in Notepad++?

Question

Notepad++

Let's imagine that I have lines:
A
B
C
D

How to make it so that after each line Enter is put, so that it turns out like this:
A

B

C

D

In Notepad ++ or in another text editor.

Answer 1

Replace \r\n with \r\n\r\n