General user settings
Use Arrow keys to scroll up and down the list without displaying the list
If you select this option, pressing the up and down arrow keys will scroll to the previous/next item in the list (without displaying the list).
If you clear this option the up-and-down arrow keys will simply display the list.
When you change this option you need to restart the application before it takes effect.
Document Manager
These settings relate to the new document manager for web.
Grid settings
See Virtual scrolling for grid virtualisation details.