Where do I change theme, reading pane, and notifications?

You want to change theme, reading-pane layout, or notification behaviour.

1. Step 1 — Open Settings

   Ctrl+, or Settings on the rail.

2. Step 2 — Appearance

   Choose light/dark/system theme if offered.

3. Step 3 — Reading pane

   Set right/bottom/hidden layout per preference.

4. Step 4 — Notifications

   Adjust new-mail toast / sound options as available.