Board Thread:Support Requests - Getting Technical/@comment-2186554-20180423221044/@comment-9605025-20180425214818

The difference in editors is because of two factors. First is your preferences set at Special:Preferences. I am guessing your preferred editor not set to "Source editor". As such, since "VisualEditor" is not available for message walls, your browser attempts to use "Classic rich-text editor". However, that option is currently disabled in Edge due to bugs; which is why Edge defaults to the source editor. This is the second factor.