Make the editor yours

Open Preferences

Press ⌘, or choose Preferences… from More actions. Settings adjust the editor experience; they do not rewrite Markdown formatting in your file.

Reading and writing comfort

Control	What it changes	When it helps
Theme	System, Light or Dark	Match the room or follow macOS.
Editor font size	Source text size	Make long writing sessions more comfortable.
Editor line height	Space between source lines	Give dense paragraphs more breathing room.
Wrap long lines	Visual wrapping in the editor	Read paragraphs without horizontal scrolling.
Show line numbers	A numbered source gutter	Discuss a specific line or inspect a long file.
Check spelling	Editor spellchecking	Catch typing mistakes while writing.
Preview width	Width of the rendered text column	Keep paragraphs easy to scan.
Show formatting bar	Formatting controls	Keep tools nearby or simplify the writing surface.

Arrange the two views

Use Editor split or the draggable divider to balance source and preview. Enable Sync editor and preview scrolling to follow the same part of a document in both panes.

Zoom adjusts the editor and preview together. Use ⌘+ (or ⌘=), ⌘− and ⌘0 to zoom in, zoom out or return to actual size. Zoom is different from adding a larger heading to your document.

Remote images

Load remote images is off by default. Leave it off unless you want the preview to contact image hosts named in the document. Workspace-local images can work without enabling remote images.

Exports block remote resources even if you enabled them in the preview. For a portable document, use local attachments and check your export.

Optional AI and local data

AI Connections contains the separate opt-in setup. Follow connect an AI model before entering provider credentials.

Local app data includes the reset flow. It can remove preferences and recovery data, so it is not the way to reset a font size. Read updates and removal before using it.