How to remove line breaks in odt paragraphs?

[joe at actionline.com]

How to remove line breaks in odt paragraphs?

Searching the 'net turns up no solution that I can get to work.

Some suggested using edit > find and replace to replace "\n" with a
space after checking "regular expressions" but that did not work for
me.

Some suggested installing an "altsearch" extension (which was
ridiculously difficult to find). Searching for "altsearch" at the
libre office extensions page does not find it. Eventually I did find
it (under a different name) and installed it, but it also does not
work for me. Please refer to this screen capture:
http://www.upquick.com/temp/altsearch.jpg