Windows 10 sends everything you search in the start menu to its servers to get Bing search results.
So make sure you don’t enter anything personal in the search box. Otherwise, you can simply disable Bing integration:
Click Win + R.
enter egedit and click OK.
Go to: HKEY_current_usersoftware\policies\microsoft\windows\Explorer
click the RMB on an empty space.
Select Create -> DWORD parameter (32 bits).
In the name field, enter: DisableSearchBoxSuggestions
Double-click on the created file.
Set the value to 1.
Restart your PC.
Done. Integration with Bing is disabled. If you need to return everything as it was, then go back to the same path. Delete the created file or change the parameter value to .