Mám LO 6.4.3.2, ale mělo by to asi být stejné ...

Edit -> Find & Replace -> Find $ (znak dollar) Replace  (znak mezera - nebo co chceš)  Regular Expressions (fajfka - zaškrtnout)

Nepřekvapivě jsem to našel v Helpu,
Text Documents (Writer) -> Command and menu referrence -> Menus -> Edit -> Find & Replace -> Regular expressions -> List of Regular Expressions

$ The end of a paragraph or cell. Special objects such as empty fields or character-anchored frames at the end of a paragraph are ignored. Example: "Peter$" matches only when the word "Peter" is the last word of a paragraph, note "Peter" cannot be followed by a period.
$ on its own matches the end of a paragraph. This way it is possible to search and replace paragraph breaks.

https://help.libreoffice.org/6.4/en-US/text/shared/01/02100001.html?&DbPAR=WRITER&System=UNIX