espocrm-base/application/Espo/Resources/metadata/app/defaultDashboardLayouts.json

{
	"Standard": [
	    {
	    	"name": "My Espo",
		    "layout": [
		    	[
			        {
			            "name": "Stream",
			            "id": "d0004"
			        },
			        {
			            "name": "Calls",
			            "id": "d0001"
			        }
			    ],
			    [
			        {
			            "name": "Tasks",
			            "id": "d0003"
			        },
			        {
			            "name": "Meetings",
			            "id": "d0002"
			        }
			    ]
			]
		}
	]
}