Hidden Debug Pane in SharePoint Online when using Edge

Hello,
has anyone ever noticed there's a debug pane in SharePoint Online?
I'm not talking about the developer dashboard which you can display using [CTRL-F12].

But when you use the Edge browser and you press [ALT-´], you get a completely different pane with several tabs. A colleague found this by accident. We have been looking for information or documentation on this but there is nothing to be found of this pane. I also asked around and actually nobody has ever seen this. It only works in Edge.