Great! According to your video, I think you’ve grasped almost anything!
The failure was because you enabled “Treat CR and LF Separately” in “Advanced”.
Read the last sentence at the bottom of this page:
http://www.emeditor.org/en/howto_search_search_nl.html
Let’s see if Yutaka will optimize the Multiline mode:
https://www.emeditor.com/forums/topic/advanced-search-options/#post-25961
I suggest you reset the Advanced options.
Use them only when needed.