Start a debug session.
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And make sure your PL/SQL has been compiled for debug, and that you either set a break point in the code or select the Step into radio button of the Start Debugging Option in the Debugger preferences. Also here is something Jeff wrote a while back...
Tried. Not shown.
It showed up once, I then closed it. Since then, it never showed up again, even in the debug mode.
try resetting your desktop
Window > reset windows to factory settings
First right mouse click to make both the spec and body compiled for debug.
Then, start the debug session
If the Smart Data is not shown, go to the menu bar --> View --> Debugger --> Smart Data
The Smart Data should show up.
You should post images of what you see. Presumably you mean the debugger pane comes up with the Data tab and so on, but not the Smart Data tabs? What about the Debugger preferences?
Hopefully Jeff's suggestion will do the trick. Otherwise the next step would be Tools > Features > Clear Cache, or nuke your user settings entirely, or even upgrade to the current production version, 17.4, of SQL Developer -- that lets you either migrate prior user settings or get fresh, default user settings.