go to or create key HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge
create a new DWORD (32-bit):
Value name: HubsSidebarEnabled
Value data: 0
according to articles on the internet, you should reload policies (in Edge, go to edge://policy), I never had to - I just restarted Edge, and the Bing Discover button was gone
In Microsoft Search
< 03/05/2023
in the 'modern' Settings, choose Privacy & security
then click on Search permissions
in the Cloud content search section, disable both:
Microsoft account
Work or School account
> 03/05/2023
go to registry key HCU\Software\Microsoft\Windows\CurrentVersion\Search
create DWORD BingSearchEnabled with value 0
this results in no Chat Bing AI results
but also no web results (but who cares)
(this change doesn't require you to restart your pc)