LovaLace Tablet view full width

Hi and a happy new year.

I am tiring to build a new dashboard for a tablet view and i have the problem that the vertical-stack is not filling up the full width.
Currently it look like following:

But i want that the full screen is nearly used. What i can do is to use the pannel Mode but then it is in my opinion to big.

Is there a possibility to set a style for the width of a vertical stack so that the screen is fulled up to 80% ?
Or am i generally here on the wrong track?
Nice would be following:

My code looks like following:

type: vertical-stack
cards:
  - type: horizontal-stack
    cards:
      - type: grid
        columns: 4
        title: Wohnzimmer
        cards:
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
      - type: grid
        columns: 4
        title: Flur
        cards:
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
            show_name: true
            show_icon: true
  - type: horizontal-stack
    cards:
      - type: grid
        columns: 4
        title: Küche
        cards:
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
      - type: grid
        columns: 4
        title: Schlafzimmer
        cards:
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche
          - type: button
            tap_action:
              action: toggle
            entity: light.kuche