Interface
All appearance settings live under Settings → Appearance and apply immediately.
Themes
Five built-in themes plus Auto, which follows your system, or Custom to set your own palette with live color pickers. An accent color picker sits on top of whichever theme you choose, letting you tweak the highlight color independently of the base theme; button color is separate again.
Your choices are written to a file next to your other settings, not only to the window’s browser storage, so they survive a reinstall and are identical in every window.
Fonts
Choose the app’s typeface from a preset list (including Eon Phoenix’s own typeface, Inter, Space Grotesk, and a few others), or supply your own custom font. Each of the three panels — sidebar, message list, reading pane — can carry its own font and its own text size, so you can read messages in a serif face while menus and buttons stay in the default sans-serif.
In the main client you type the name of a font your system knows. The
native Gio client can’t look fonts up by name: there you pick a file
(.ttf or .otf). woff2 is refused — that client can’t read the
format.
Layout
- Density — compact, cozy, or comfortable spacing throughout the app.
- Shape — sharp, rounded, or fully round corners on buttons and panels.
- Reading pane — show the selected message beside the list (on) or open it full-width (off).
- Compact sidebar — collapse the folder sidebar to icons only, hiding labels, to save horizontal space.
- Avatars and message preview — toggle sender initials and preview snippets in the message list on or off.
Folders and tags
Drag folders in the sidebar to reorder them. Messages can carry one or more tags, which you can filter by; combine several tags at once to narrow the list further. Deterministic rules (Settings → Filters) can apply tags or route mail automatically based on conditions you define, similar to filters in other mail clients.
Typing cursor style
A small personalization option (Settings → Appearance) lets you pick the shape of the text cursor used while composing a message — a thin bar, a solid block, or an outlined block.