builder.Services
    .AddGraphQLServer()
    .ModifyPagingOptions(opt =>
    {
        opt.MaxPageSize = 5;
    });

query {
 testGlobalPagingOptions(first: 10, after: null, last: null, before: null) {
   edges {
     cursor
     node {
       id
       timestamp
       value
     }
   }
   pageInfo {
     endCursor
     hasNextPage
     hasPreviousPage
     startCursor
   }
 }
}

query {
  testPerCasePagingOptions(first: 5, after: null, last: null, before: null) {
    edges {
      cursor
      node {
        id
        timestamp
        value
      }
    }
    pageInfo {
      endCursor
      hasNextPage
      hasPreviousPage
      startCursor
    }
  }
}

{
  "errors": [
    {
      "message": "The maximum allowed items per page were exceeded.",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "testGlobalPagingOptions"
      ],
      "extensions": {
        "code": "HC0051",
        "fieldCoordinate": "Query.testGlobalPagingOptions",
        "requestedItems": 10,
        "maxAllowedItems": 5
      }
    }
  ],
  "data": {
    "testGlobalPagingOptions": null
  }
}