vscode expand all

Use :
Ctrl + K + 0 to fold all 
Ctrl + K + J to unfold all

Ctrl+Shift+[    Fold (collapse) region  editor.fold
Ctrl+Shift+]    Unfold (uncollapse) region  editor.unfold
Ctrl+K Ctrl+[   Fold (collapse) all subregions  editor.foldRecursively
Ctrl+K Ctrl+]   Unfold (uncollapse) all subregions  editor.unfoldRecursively
Ctrl+K Ctrl+0   Fold (collapse) all regions editor.foldAll
Ctrl+K Ctrl+J   Unfold (uncollapse) all regions

ctrl + 0  to 9  : "to collaapsse level" 
ctrl + j  : "to Fold all"