Shift+Alt+A
Here you can find all the keyboard shortcuts.
All VSCode Shortcuts
PS: I prefer Ctrl+Shift+/ for toggling block comments because Ctrl+/ is shortcut for toggling line comments so it’s naturally easier to remember. To do so, just click on the settings icon in the bottom left of the screen and click ‘Keyboard Shortcuts’ and find “toggle block…”. Then click and enter your desired combination.
First, select the lines you want to comment/uncomment (CTRL+L is convenient to select a few lines)
Then:
To toggle line comments, execute editor.action.commentLine (CTRL+/ on Windows)
or
To add line comments, execute editor.action.addCommentLine (CTRL+K CTRL+C)
To remove line comments, execute editor.action.removeCommentLine (CTRL+K CTRL+U)
or
To toggle a block comment, execute editor.action.blockComment (SHIFT-ALT-A)
See the official doc : Key Bindings for Visual Studio Code