Expand Original UI card to take up all of screen

group:
    default_view:
        view: true
        icon: mdi:home
        entities:
        - group.zipato
        #- group.coffee
    test_panel:
        name: "Test Panel"
        view: true
        icon: mdi:radiator
        entities:
        - group.zipato
        - binary_sensor.HeatStatus
    zipato:
        name: "Heating"
        icon: mdi:radiator
        entities:
        - switch.zipato_sensor  
        - sensor.currenttemp
        - sensor.desiredtemp
        - input_number.thermo_slider
    coffee:
        name: "Coffee"
        control: hidden
        entities:
        - script.make_coffee
        - sun.sun
        #- script.make_test

How do I make default_view take up the whole screen so I have more accuracy with the slider?