Swagger UI expand/collapse for Enum component.

Q&A (please complete the following information)

• OS: macOS
• Browser: chrome
• Version: Latest
• Swagger-UI version: 3.52.3

Description

When I use Enum in components schemas. I can expand the TypeEnum object, but there is no button for me to collapse the object.

There is "arrow" button to expand

While I can collapse Item, I cannot collapse TypeEnum, I have to refresh the page

Example Swagger/OpenAPI definition:

openapi: 3.0.2
info:
  title: FastAPI
  description: ''
  version: 0.1.0
paths:
  /items/:
    get:
      summary: Read Items
      operationId: read_items_items__get
      parameters:
        - required: false
          schema:
            title: Q
            maxLength: 50
            type: string
          name: q
          in: query
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                title: Response Read Items Items  Get
                type: array
                items:
                  $ref: '#/components/schemas/Item'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    HTTPValidationError:
      title: HTTPValidationError
      type: object
      properties:
        detail:
          title: Detail
          type: array
          items:
            $ref: '#/components/schemas/ValidationError'
    Item:
      title: Item
      required:
        - name
        - price
        - tags
      type: object
      properties:
        name:
          title: Name
          type: string
        description:
          title: Description
          type: string
        price:
          title: Price
          type: number
        tax:
          title: Tax
          type: number
        tags:
          $ref: '#/components/schemas/TypeEnum'
    TypeEnum:
      title: TypeEnum
      enum:
        - predicted
        - measured
      type: string
      description: An enumeration.
    ValidationError:
      title: ValidationError
      required:
        - loc
        - msg
        - type
      type: object
      properties:
        loc:
          title: Location
          type: array
          items:
            type: string
        msg:
          title: Message
          type: string
        type:
          title: Error Type
          type: string

Expected behavior

There is a arrow button after expanding to collapse the tab.

Screenshots

Additional context or thoughts

Reproduce the issue in Swagger UI 3.52.3 using the supplied OpenAPI definition, focusing on the TypeEnum component under Item. Inspect the Enum component's expanded and collapsed states; done means the expanded TypeEnum has an arrow control that collapses it without refreshing the page.