Hi,
I was one of the many who missed the View > Snippets entry in the menu.
Clear Cache (in Tools > Features) did not help, and did not want to throw away all my settings as suggested in another thread.
What helped in my case was editing the file:
D:\Users\<User>\AppData\Roaming\SQL Developer\system4.2.0.17.089.1709\ide-extension-prefs.xml
I had to add the following line which I found in an older version:
<string v="oracle.sqldeveloper.snippet"/>
to the xml:
<ide:extension-preferences xmlns:ide="http://xmlns.oracle.com/ide/hash">
<list n="featuresToReloadAtStartup">
<string v="oracle.sqldeveloper.filenavigator"/>
<string v="oracle.sqldeveloper.snippet"/>
<string v="oracle.sqldeveloper.dbanavigator"/>
...
</list>
</ide:extension-preferences>
Hope this helps,
Sabine