VSCode Toggle Explorer

{
    "key": "alt+1",
    "command": "workbench.view.explorer",
    "when": "viewContainer.workbench.view.explorer.enabled"
},
{
    "key": "alt+1",
    "command": "workbench.action.closeSidebar",
    "when": "sideBarVisible && activeViewlet == 'workbench.view.explorer'"
},