If any field set as
[unversioned] and sharing label is not visible to content editor or any other non-Admin user then follow the mentioned steps. It is tested in Sitecore 9.2.
In the <settings> section, add the following setting: <!-- CONTENT EDITOR SHOW FIELD SHARING LABELS Determines whether or not the Content Editor displays field sharing labels ([shared] and [unversioned]) to users that are not Sitecore administrators. Default value: false --> <setting name="ContentEditor.ShowFieldSharingLabels" value="false"/>
It seems Sitecore hides the
Shared label by default for non-Admin users. Just change the value of the following setting to true:
<setting name="ContentEditor.ShowFieldSharingLabels" value="true"/>
If you have any thoughts on this, please drop a comment.