@Note, Thanks for posting in Q&A. After researching, I find the following Administrative Template files can configure default file location.
https://www.microsoft.com/en-us/download/details.aspx?id=49030
But after testing, I find it only changes the default file location. The option 'Save to computer by default' is not selected.
Then I go to do more researching and checking, I find currently the setting is not included in Administrative Template files yet.
After do more deep researching and testing I find this can be set via registry key. We can set registry key HKCU\Software\Microsoft\Office\16.0\Common\General\PreferCloudSaveLocations
to 0
to enable 'Save to computer by default". You can try.
Hope the above information can help.
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