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Most of floating components in @membranehq/react,
like Combobox, use Portal to mount outside of the stacking context. If you are using a floating component on the default stacking context, no additional setup is required
as the default portal boundary is the <body/> element. But for cases when you want to use a floating component within another floating component, the stacking context needs to be adjusted by bounding the portal area.
This can be done with the FloatingPortalBoundary component. A common situation is a custom Modal rendered in a Portal with a Combobox as part of DataInput. 
import { DataInput } from "@membranehq/react";
import { Modal } from './my-modal'

const schema = {...}
const variablesSchema = {...}

export function ModalWithDataInput() {

  return (
    <Modal.RootWithPortal>
      <Modal.Header>Create record</Modal.Header>

      <Modal.Content>
        <DataInput
          schema={schema}
          variablesSchema={variablesSchema}
        />
      </Modal.Content>
    </Modal.RootWithPortal>
  )
}
With this setup both Modal and Combobox are rendered over their respective Portal inside of the <body />,
resulting in two separate stacking contexts and Modal might appear above Combobox.
Portal Boundary illustration
To fix this problem we should bound the Combobox portal with Modal.Content.
Use FloatingPortalBoundary to wrap the content container.
Note: FloatingPortalBoundary should only have a single child because it attaches a data-* attribute to it,
which serves as an anchor for Portal. 
import { DataInput, FloatingPortalBoundary } from "@membranehq/react";
import { Modal } from './my-modal'

const schema = {...}
const variablesSchema = {...}

export function ModalWithDataInput() {

  return (
    <Modal.RootWithPortal>
      <Modal.Header>Create record</Modal.Header>

      <FloatingPortalBoundary>
        <Modal.Content>
          <DataInput
            schema={schema}
            variablesSchema={variablesSchema}
          />
        </Modal.Content>
      </FloatingPortalBoundary>
    </Modal.RootWithPortal>
  )
}
Now, as the content has its own boundary, the Combobox from DataInput is portalled into the correct stacking context.
Portal Boundary illustration

​
Props: FloatingPortalBoundary

PropTypeDescription
childrenReact.ReactElementComponents Children. Accepts only single child.
idstring | undefinedCustom ID for boundary container. If not passed - useId is used.