Mail
Contacts
Calendar
Files
Settings
Account
Account
Addresses
Password & sign-in
App passwords
Devices
Mail
Reading & writing
Auto-reply
Folders
Rules & categories
Sharing
This device
Appearance
Notifications
Appearance
Theme and layout. They stay on this device, since a screen of its own may want another.
Theme
system
light
dark
Message list width
Or drag the edge between the list and the message.
480px
Reset appearance
Mail
Contacts
Calendar
Files
Settings