I know this was long ago, but just in case someone else references this discussion:
1) tabs may be turned off in "options"
2) clean screen may be on
3) you may be in block editor
I had this problem, and the issue was the screen maximization. Just click on the icon right next to the "Close" icon (X) and the tabs will show up. They are there, but you just can't see them because your window is either minimized or maximize.Not sure which, but doing this fixed mine!
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