How to use the terra-disclosure-manager.availableDisclosureSizes.FULLSCREEN function in terra-disclosure-manager

renderModal(manager) {
    const {
      children, disclosureAccessory, withDisclosureContainer, ...customProps
    } = this.props;

    const containerClassNames = cx([
      'container',
      customProps.className,
    ]);

    const classArray = ['modal-manager'];
    const isFullscreen = manager.disclosure.isMaximized || manager.disclosure.size === availableDisclosureSizes.FULLSCREEN;
    if (!isFullscreen) {
      if (manager.disclosure.dimensions) {
        classArray.push(`height-${manager.disclosure.dimensions.height}`, `width-${manager.disclosure.dimensions.width}`);
      } else if (manager.disclosure.size) {
        classArray.push(`height-${heightFromSize[manager.disclosure.size]}`, `width-${widthFromSize[manager.disclosure.size]}`);
      }
    }

    const presentedDisclosureComponentKey = manager.disclosureComponentKeys[manager.disclosureComponentKeys.length - 1];
    const presentedDisclosureComponentData = manager.disclosureComponentData[presentedDisclosureComponentKey] || {};
    const headerDataForPresentedComponent = presentedDisclosureComponentData.headerAdapterData;

    return (
      <div>
        {manager.children.components}
        </div>

renderModal(manager) {
    const { children, ...customProps } = this.props;

    const topComponentKey = manager.disclosureComponentKeys[manager.disclosureComponentKeys.length - 1];
    const topComponentData = manager.disclosureComponentData[topComponentKey] || {};
    const headerDataForDisclosedComponent = topComponentData.headerAdapter || {};

    const containerClassNames = cx([
      'container',
      customProps.className,
    ]);

    const classArray = ['modal-manager'];
    const isFullscreen = manager.minimizeDisclosure || topComponentData.size === availableDisclosureSizes.FULLSCREEN;
    if (!isFullscreen) {
      if (typeof topComponentData.size === 'object') {
        classArray.push(`height-${topComponentData.size.height}`, `width-${topComponentData.size.width}`);
      } else if (typeof topComponentData.size === 'string') {
        classArray.push(`height-${heightFromSize[topComponentData.size]}`, `width-${widthFromSize[topComponentData.size]}`);
      }
    }

    return (
      <div>
        {manager.wrappedChildren}
         {</div>

renderSlidePanel(manager) {
    const {
      children, panelBehavior, disclosureAccessory, withDisclosureContainer, ...customProps
    } = this.props;

    let isFullscreen;
    if (manager.disclosure.size === availableDisclosureSizes.FULLSCREEN || manager.disclosure.isMaximized) {
      isFullscreen = true;
    }

    let panelSize;
    if (manager.disclosure.dimensions) {
      panelSize = disclosureDimensionsToPanelSize(manager.disclosure.dimensions);
    } else {
      panelSize = disclosureSizeToPanelSize[manager.disclosure.size];
    }

    const presentedDisclosureComponentKey = manager.disclosureComponentKeys[manager.disclosureComponentKeys.length - 1];
    const presentedDisclosureComponentData = manager.disclosureComponentData[presentedDisclosureComponentKey] || {};
    const headerDataForPresentedComponent = presentedDisclosureComponentData.headerAdapterData;

    return (