When users compose a message in Flow they need to pay attention to which mode they are in. If they just follow their instinct to start typing, the behaviour may not meet their expectations if they assumed they were in a different mode.

Since editing modes can be problematic, we can differentiate them more:

• Using a monospaced font-family for wikitext (which are commonly associated with the idea of "code"), while keeping the standard sans-serif for rich text.
• Making the bottom instructions we show for wikitext more prominent (and explicitly stating you are on wikitext mode)

The above ideas are illustrated below: