Use Existing File window to view new file
(unless SHIFT pressed)
By default, every file you view will be displayed in a separate window. Enable this option if you prefer to only have one file window open at a time. If you enable this option, you can still view files in a separate window by pressing the SHIFT key when you view the file.
Automatically Tile multiple file windows
(Auto-Arrange, Vertical, Horizontal)
Enable this option if you want multiple file windows to be automatically tiled.
Auto Arrange Grid Size
This defines the grid size used for auto-arranging.