Hi @自立 徐,
As far as I know, different products store the different configure settings by different ways. There is no option can restore Office directly.
In my opinion, you can download the Office tool to uninstall Office from PC completely and then re-install it: https://aka.ms/SaRA-officeUninstallFromPC
And you can also refer to this support article about removing Office from PC manually: https://support.microsoft.com/en-us/office/manually-uninstall-office-4e2904ea-25c8-4544-99ee-17696bb3027b
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