Can't turn off cinematic preview/viewport.

I have the same issue.
My current work around:

  1. Go to window->viewports and open a second viewport tab.
  2. Click the upper left corner of viewport 1 !
  3. Now close viewport 1.
  4. Reopen viewport 1 from window->viewports menu.

This at least works for me. Hope it helps until the bug is resolved.
-F4Q

UPDATE:
Just figured out that my answer is obsolete. The easy way is to simply hit shift-d in the selected viewport.

  1. Shift-d for default viewport.
  2. Shift-c for cinematic viewport.
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