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... even though the feature *is* enabled ...
You might try Tools > Features... > Clear Cache and restart SQL Developer as described in...
Menu item to View/Update Snippets is missing in 4.2.0.16.356.1154.
If that does not help, edit the ide-extension-prefs.xml as described in...
SQLDev 4.2: Missing Snippets Menu Entry - solution
The change to the xml will be the same as for 4.2
Tx Gary (and "ApexBine"), editing the xml file worked.