Taken from https://pureinfotech.com/disable-web-search-windows-10-version-1803/ as my notes
How to disable web search results on Windows 10
If you want to disable web search result when using search box in the taskbar, do the following:
Warning: It’s very important to note that modifying the Windows Registry can cause serious problems if not used properly. It’s assumed you know what you’re doing and that you have created a full backup of your system before proceeding.
- Open Start.
- Search for regedit, right-click the top result, and select Run as administrator.
- Browse the following path:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Search
- Double-click the CortanaConsent key.
- Set the key value from 1 to 0.
- Click the OK button.
- On the left pane, right-click the Search (folder) key, and select New, and click on DWORD (32-bit) Value.
- Name the new key AllowSearchToUseLocation, press Enter, and leave its default value of 0.
- On the left pane, right-click the Search (folder) key, select New, and click on DWORD (32-bit) Value.
- Name the new key BingSearchEnabled, press Enter, and leave its default value of 0.
- Browse the following path:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows
- Right-click the Windows (folder) key, select New, and click on Key.
- Name the key Windows Search and press Enter.
- On the left pane, right-click the Windows Search (folder) key, and select New, and click on DWORD (32-bit) Value.
- Name the new key ConnectedSearchUseWebOverMeteredConnections, press Enter, and leave its default value of 0.
- On the left pane, right-click the Windows Search (folder) key, and select New, and click on DWORD (32-bit) Value.
- Name the new key AllowCortana, press Enter, and leave its default value of 0.
- On the left pane, right-click the Windows Search (folder) key, and select New, and click on DWORD (32-bit) Value.
- Name the new key DisableWebSearch and press Enter.
- Double-click the newly created key and change its value from 0 to 1.
- On the left pane, right-click the Windows Search (folder) key, and select New, and click on DWORD (32-bit) Value.
- Name the new key ConnectedSearchUseWeb, press Enter, and leave its default value of 0.
After completing the steps, restart your computer to complete disabling web search on Windows 10. However, remember that using these instructions also completely disables Cortana, as the assistant relies on the web.
At any time, you can revert the changes to enable web search and Cortana using the same steps, but on step No. 5, make sure to change the key value to 0. On step No. 8, right-click the AllowSearchToUseLocation key and select Delete. On step No. 10, right-click the BingSearchEnabledand key and select Delete. On step No. 11, right-click the Windows Search key and select Delete to delete all the remaining keys. Finally, restart your device to apply the changes.