Azure Web App Configuration not able to Edit/Delete

When I was trying to Edit my Web App through Configuration I see those options are disabled !Not sure what happened !

Solution

Ok, Lesson learned, I found what is the cause for this at last.

Actually I was performing some slot swap along with the Preview feature. I started the swap and left before complete it (totally forget)

Due to this, my configurations were gone to read-only mode. Once I completed the swap I can now able to edit the configurations.