The label of the Articles content tab contains the name of the article, alerter marker and the closing button.
The article name is displayed shortened if longer than 33 characters.
The alert marker - a blue triangle - swings if there's article content to update.
The closing button x appears only on the current article tab.
The information, displayed on the content tab label is hard-coded and you cannot configure it.
More general information
Content tab label in the GN4 Work Area chapter