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  • Start Safari
  • full-screen Safari
  • open at least 2 tabs
  • click and drag one of them away from the tab bar
  • release left-click
  • it creates a new full-screen Safari instance, with that tab as the only tab

Now, how do I take that tab, and put it back into the other Safari window?

  • If you only have the one window which had two tabs and now is two full screen windows, you can do Safari > Window > Merge All Windows but that is only good in that scenario, otherwise you'd have to bring both windows out of full screen, add a new tab to one of the windows and then drag the other tab back to the other window, then close the window that you opened a new tab on. – user3439894 Jun 3 at 17:49

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