Item actions
Select an item before using a shortcut (click on a line containing a box to highlight it). New item →EnterNew sub-item → Shift + EnterDelete selected item → Delete Navigation
Select Item →Left-ClickContext menu → Right-ClickItem navigation → ↓ and ↑Collapse/Expand → ← and →Remove selection → EscapeOther
Toggle wallboard mode → Z
Undo → Cmd + Z
Open System-Info Dialog → Shift + I
Open Help Dialog → Shift + /
Play a BigPicture game → Shift + G