Monkey patch document list to hide create menu

desk-structure.js

import S from '@sanity/desk-tool/structure-builder'

const DocumentListSansCreate = ({ title, filter }) => {
  const _documentList = S.documentList()
    .title(title)
    .filter(filter)

  _documentList.__serialize = _documentList.serialize.bind(_documentList)
  _documentList.serialize = (...args) => {
    const { menuItems, ...rest } = _documentList.__serialize(...args)
    const createMenuIdx = menuItems.findIndex(({ intent }) => intent.type === 'create')
    menuItems.splice(createMenuIdx, 1)
    return {
      menuItems,
      ...rest,
    }
  }

  return _documentList
}

const PostList = () =>
  S.listItem()
    .title('Posts')
    .child(
      DocumentListSansCreate({
        title: 'Post',
        filter: '_type in ["post"]',
      })
    )

export default () => {
  return S.list()
    .title('Content')
    .items([
      PostList(),
      /* etc */
    ])
}