-If using TeX fonts and en- and em-dashes are output as font ligatures,
-when exporting documents containing en- and em-dashes to the format of
-LyX 2.0 or earlier, the following line has to be manually added to the
-unicodesymbols file of that LyX version:<br>
-0x200b "\\hspace{0pt}" "" "" "" "" # ZERO WIDTH SPACE<br>
-This avoids "uncodable character" issues if the document is actually
-loaded by that LyX version. LyX 2.1 and later versions already have the
-necessary definition in their unicodesymbols file.
+By default, LyX 2.3 outputs en- and em-dashes as -- and --- respectively,
+so that a line break can occur in the output immediately after the dash.
+Sometimes, this results in undesired line breaks or overfull lines due to
+suppression of hyphenation in the word preceding the dash.
+Select "Document->Settings->Fonts->Disallow line breaks after dashes"
+to keep the LyX 2.2 behaviour.
+See chapter 3.9.1.1, "Dashes and Line Breaks", of the User Guide
+for details.