GraphQLPlayground options like `fixedEndpoint`, `shareEnabled` not working

[marceloverdijk]

This issue pertains to the following package(s):

• GraphQL Playground - Electron App
• GraphQL Playground HTML
• GraphQL Playground
• GraphQL Playground Express Middleware
• GraphQL Playground Hapi Middleware
• GraphQL Playground Koa Middleware
• GraphQL Playground Lambda Middleware

What OS and OS version are you experiencing the issue(s) on?

macOS Mojava

What version of graphql-playground(-electron/-middleware) are you experiencing the issue(s) on?

master

What is the expected behavior?

Configuration options picked up.

What is the actual behavior?

Configuration options not picked up.

What steps may we take to reproduce the behavior?

• Copy https://github.com/prisma/graphql-playground/blob/master/packages/graphql-playground-html/minimal.html
• Change

  <script>window.addEventListener('load', function (event) {
      GraphQLPlayground.init(document.getElementById('root'), {
        // options as 'endpoint' belong here
      })
    })</script>

to e.g.

  <script>window.addEventListener('load', function (event) {
      GraphQLPlayground.init(document.getElementById('root'), {
        endpoint: 'https://mycom.com/graphql',
        fixedEndpoint: true,
        isReloadingSchema: false,
        shareEnabled: false
      })
    })</script>

Although fixedEndpoint and shareEnabled are set to appropriate values the endpoint is still editable and the share button displayed (as can be seen in screenshot below).

Please provide a gif or image of the issue for a quicker response/fix.