In vscode or vim it is possible to fold/unfold blocks with Ctrl+Shift+[. However in the swiss french keyboard the [ symbol is done with AltGr+è, so Ctrl+Shift+AltGr+è doesn't work.
Any hint?
You can use ctrl+shift+' and ctrl+shift+^, i.e., the two keys left of backspace.
(Hat tip to http://www.kbdedit.com/, whose author told me.)