Hi while I use Edge always browsers redirects to search yahoo, it looks like a Yahoo virus because I have tried to:
Turn off website notifications in Microsoft Edge by opening the Menu (three horizontal dots) in the top-right corner of the screen and selecting Settings. Go to Advanced options by clicking. To access the Website permissions section, scroll down. Click Manage Permissions. for removing the push notifications malware from Microsoft Edge Locate notifications and delete any dubious domains. Disable push notifications in Microsoft Edge delete browsing history
Return to the upper right corner and click the three dots, then select Settings. Locate the Choose what to clear button under the Clear Browsing Data section. clear browsing data in Microsoft Edge Select every item in the following box, then click Clear.