少しググってみた
これ↓で直った人いるみたいよ
保証はしないけど
https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/18153935/
Daniel N. Sep 4, 2018
If you are allowed to use powershell, execute the following command as your user to fix the dev tool:
Add-AppxPackage -register “C:\windows\SystemApps\Microsoft.MicrosoftEdgeDevToolsClient_8wekyb3d8bbwe\AppxManifest.xml” -DisableDevelopmentMode -Confirm:$false
