Edge opens multiple instances / blank window / cant close – Reset Edge to defaults

Reset Edge to defaults

Delete contents of:
C:\Users\%username\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe

Windows Powershell (admin):
Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml” -Verbose}

Source: HowToGeek