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忘記附上我使用的QT版本是5.15.14.

@Lee_Corl said in I didn't create a toolBar, why does it appear? How can I delete the toolBar?:

@SGaist I dont use it

What do you mean ?

@xyxxx 我也遇到了，请问有解决方法吗？

当然不行，QWidget及其子类只能在主线程中创建运行。

@JonB Finally, I chose Qt under Linux, which is convenient for Windows installation environment. Thank you

Set environment variable QT_DEBUG_PLUGINS to 1 and re-run.