Just archiving this common fix here so that other creators can easily find it! 
When you start up normal Creative (not UEFN) from the normal FN game’s lobby, you may find yourself dropped into a blank UEFN island, with an error message in the corner of the screen saying “Editor Is Not Connected.” There’s no “Return to Hub” option in the Settings sidebar.
Don’t worry! Here are the steps to fix it:
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Press Esc to open the side menu, and then click the backwards red arrow at the bottom to return to the lobby.
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Click “Change” on the window above the Play button, on the right of the screen, to change your destination away from Creative to an actual game.
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From the Discover menu, choose the Create Tab and click the Create button.
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In the lobby, click to Play Creative.
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That’s it! You should now be in the hub and you can access your console, like normal. Happy building!
