Block Web Search in Windows 10 1803+
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In Regestry: (type regedit in run or search)

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Search

DWORD (32-Bit): "BingSearchEnabled" Value: 0
DWORD (32-Bit): "AllowSearchToUseLocation" Value: 0
DWORD (32-Bit): "CortanaConsent"  Value: 0
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From: https://news.softpedia.com/news/how-to-block-web-search-in-windows-10-april-2018-update-521646.shtml
Date: 6th February 2020