How to close macbook auto-recovered PPT files ？

Question：

Whenever I open a powerpoint on my Mac laptop, some autorecovers will open behind automatically.

So I have to close them manually one by one, which is quite annoying every time. 

How can I find and remove them to solve this problem once and forever ???

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Answer：

Step1：Check the following local paths in your macbook system:

~/Library/Containers/com.microsoft.powerpoint/Data/Library/Preferences/AutoRecovery/

Step2：Remove all the auto-recoverd PPT files.

Then, these autorecovers will not appear when you open a PPT next time.