Notepad++ expand/collapse block with keyboard

In short:
Alt+0 folds (collapses) all Blocks
Alt+1 folds all Level 1
Alt+2 folds all Level 2
Alt+x etc.

and
Alt+Shift+0 Unfolds all
Alt+Shift+1 Unfolds Level 1
Alt+Shift+2 Unfolds Level 2
Alt+Shift+3 Unfolds Level 3
Alt+Shift+x etc.

And yes, bzlm, in the ShortCut Mapper, in the Menu 'Settings', the command Alt+3 is mapped to a Command named 3. This one is below the command Collapse Current Level, so the meaning is Collapse Level 3 or Fold all Level 3 Blocks

Ctrl+Alt+F collapse current level and Ctrl+Alt+Shift+F expand it.