Texts.io is new to me, but looks fantastic. Does it use a two window (Markdown and preview) though? I've never been pleased with the idea of my writing being av

Texts.io is new to me, but looks fantastic. Does it use a two window (Markdown and preview) though? I've never been pleased with the idea of my writing being available as a "preview" alongside the source, I want just one window to worry about.