<aura:component implements="lightning:homeTemplate" access="global" >

    <aura:attribute name="dashboard" type="Aura.Component[]" access="global"/>

    <div aura:id="container">

        <lightning:layout >
            <lightning:layoutItem aura:id="dashboard" size="12" class="dashboard">
                {!v.dashboard}
            </lightning:layoutItem>
        </lightning:layout>

    </div>

</aura:component>

<design:component label="One column layout">
    <flexipage:template >
        <flexipage:region name="dashboard" defaultWidth="MEDIUM">
            <flexipage:formfactor type="MEDIUM" width="LARGE" />
        </flexipage:region>
    </flexipage:template>
</design:component>