By default, Motif displays as a split screen, with the content editor on the left, and the rendered preview on the right. Sometimes, however, you may want to focus just on writing, without needing to see the final result. In order to quickly jump into distration-free editing, hit . This removes all decorations, including the preview, the sidebar and the tab bar. You can exit distraction-free mode by hitting again.
While writing, you may occasionally want to inspect the preview result. You can do so by hitting , which will toggle full-screen preview.