As ProfiMail may be run on devices with various screen sizes, it offers two main screen modes.
This layout mode is mainly applied to Account list, which is primary entry screen of ProfiMail.
Single pane
In this mode, screen will show single activity at a time, for example list of accounts, list of messages, etc.
This is usable for smaller screens.
Multi pane
In this mode, screen will be split to parts, each showing different activity. This is intended for larger screens.
Which one is used
The layout is either chosen automatically depending on available screen width, or may be set in Configuration.
There are two independent settings for screen in portrait mode, and screen in landscape mode, since available screen width depends on screen orientation.