Board Thread:New Features/@comment-896291-20180305231708/@comment-9605025-20180306180855

Based on your title, I am guessing that, by "source editor", you really mean rich-text editor and that, by "basic HTML editor", you really mean source editor. If that is the case, use Special:Preferences to set your preferred editor.

FYI, there are essentially 5 types of editors currently in use: Infobox Builder, VisualEditor, MiniEditor, rich-text-editor, and source editor. The first 4 all have a way to get to a source-editor-like interface. Infobox Builder is a GUI used for simple portable infoboxes. VisualEditor is a GUI used for pages. MiniEditor is like classic editor but for Forums and comments. Classic editor (the collective name for rich-text editor and source editor) is for pages. Classic editor will default to source editor only if your editor preference is set to "Source editor". This setting also affects MiniEditor's default.