Visual Studio how to collapse all code example

Example 1: visual studio code collapse all

// Fold
Ctrl + K + 0 // fold everything that could be folded
Ctrl + K + 1 // fold just the main branches

// Unfold
Ctrl + K + J // unfold everything

Example 2: collapse all code visual studio

Visual studio 
fold all: Ctrl + M + O
unfold all: Ctrl + M + P