It doesn't matter. You use layouts.
But... if you really really insist in having it as the central widget:
Create a new widget, then in your main window constructor create a new object of your tab widget, then set it as the central widget.
It doesn't matter. You use layouts.
But... if you really really insist in having it as the central widget:
Create a new widget, then in your main window constructor create a new object of your tab widget, then set it as the central widget.
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