Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
Search in Sidebar allows users to open search result in sidebar (including sidebar search for Progressive Web Apps). If you configure this policy to 'EnableSearchInSidebar' or don't configure it, Search in sidebar will be enabled. If you configure this policy to 'DisableSearchInSidebarForKidsMode', Search in sidebar will be disabled when in Kids mode. Some methods that would normally invoke sidebar search will invoke a traditional search instead. If you configure this policy to 'DisableSearchInSidebar', Search in sidebar will be disabled. Some methods that would normally invoke sidebar search will invoke a traditional search instead. Policy options mapping: * EnableSearchInSidebar (0) = Enable search in sidebar * DisableSearchInSidebarForKidsMode (1) = Disable search in sidebar for Kids Mode * DisableSearchInSidebar (2) = Disable search in sidebar Use the preceding information when configuring this policy.