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Set maximum group count

You can restrict the condition set by defining the maxGroupCount property. By default, the value is 5. In the below demo, the maxGroupCount is set to 2 .

Source
Preview
app.tsx
index.html
datasource.ts
app.jsx
import { ColumnsModel, QueryBuilderComponent, RuleModel } from '@syncfusion/ej2-react-querybuilder';
import * as React from 'react';
import * as ReactDom from 'react-dom';
// @ts-ignore
import { hardwareData } from '../datasource.ts';

class App extends React.Component<{}, {}> {

    public columnData: ColumnsModel[] = [
        { field: 'TaskID', label: 'Task ID', type: 'number' },
        { field: 'Name', label: 'Name', type: 'string' },
        { field: 'Category', label: 'Category', type: 'string' },
        { field: 'SerialNo', label: 'Serial No', type: 'string' },
        { field: 'InvoiceNo', label: 'Invoice No', type: 'string' },
        { field: 'Status', label: 'Status', type: 'string' }
    ];
    public importRules: RuleModel = {
        'condition': 'or',
        'rules': [{
            'field': 'Category',
            'label': 'Category',
            'operator': 'equal',
            'type': 'string',
            'value': 'Laptop'
        }]
    };

    public render() {
        return (
            <QueryBuilderComponent width='100%' maxGroupCount={2} dataSource={hardwareData} columns={this.columnData} rule={this.importRules} />
        );
    }
}
ReactDom.render(<App />,document.getElementById('querybuilder'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React Query Builder</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-querybuilder/styles/material.css" rel="stylesheet" />
	<link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
        <div id='querybuilder'>
            <div id='loader'>Loading....</div>
        </div>
</body>

</html>
/**
 * QueryBuilder datasource
 */
export let employeeData: Array<{[key: string]: any}> = [
	{
		'Address': '507 - 20th Ave. E.\r\nApt. 2A',
		'City': 'Seattle',
		'Country': 'USA',
		'EmployeeID': 1,
		'FirstName': 'Nancy',
		'HireDate': '22/07/2001',
		'LastName': 'Davolio',
		'PostalCode': '98122',
		'Region': 'WA',
		'Title': 'Sales Representative',
		'TitleOfCourtesy': 'Ms.'
	},
	{
		'Address': '908 W. Capital Way',
		'City': 'Tacoma',
		'Country': 'USA',
		'EmployeeID': 2,
		'FirstName': 'Andrew',
		'HireDate': '21/04/2003',
		'LastName': 'Fuller',
		'PostalCode': '98401',
		'Region': 'WA',
		'Title': 'Vice President',
		'TitleOfCourtesy': 'Dr.'
	},
	{
		'Address': '722 Moss Bay Blvd.',
		'City': 'Kirkland',
		'Country': 'USA',
		'EmployeeID': 3,
		'FirstName': 'Janet',
		'HireDate': '22/07/2001',
		'LastName': 'Leverling',
		'PostalCode': '98033',
		'Region': 'WA',
		'Title': 'Sales Representative',
		'TitleOfCourtesy': 'Ms.'
	},
	{
		'Address': '4110 Old Redmond Rd.',
		'City': 'Redmond',
		'Country': 'USA',
		'EmployeeID': 4,
		'FirstName': 'Margaret',
		'HireDate': '22/07/2004',
		'LastName': 'Peacock',
		'PostalCode': '98052',
		'Region': 'WA',
		'Title': 'Sales Representative',
		'TitleOfCourtesy': 'Mrs.'
	},
	{
		'Address': '14 Garrett Hill',
		'City': 'London',
		'Country': 'UK',
		'EmployeeID': 5,
		'FirstName': 'Steven',
		'HireDate': '02/04/2001',
		'LastName': 'Buchanan',
		'PostalCode': 'SW1 8JR',
		'Region': null,
		'Title': 'Sales Manager',
		'TitleOfCourtesy': 'Mr.'
	},
	{
		'Address': 'Coventry House\r\nMiner Rd.',
		'City': 'London',
		'Country': 'UK',
		'EmployeeID': 6,
		'FirstName': 'Michael',
		'HireDate': '22/01/2003',
		'LastName': 'Suyama',
		'PostalCode': 'EC2 7JR',
		'Region': null,
		'Title': 'Sales Representative',
		'TitleOfCourtesy': 'Mr.'
	},
	{
		'Address': 'Edgeham Hollow\r\nWinchester Way',
		'City': 'London',
		'Country': 'UK',
		'EmployeeID': 7,
		'FirstName': 'Robert',
		'HireDate': '22/07/2001',
		'LastName': 'King',
		'PostalCode': 'RG1 9SP',
		'Region': null,
		'Title': 'Sales Representative',
		'TitleOfCourtesy': 'Mr.'
	},
	{
		'Address': '4726 - 11th Ave. N.E.',
		'City': 'Seattle',
		'Country': 'USA',
		'EmployeeID': 8,
		'FirstName': 'Laura',
		'HireDate': '22/07/2001',
		'LastName': 'Callahan',
		'PostalCode': '98105',
		'Region': 'WA',
		'Title': 'Inside Sales Coordinator',
		'TitleOfCourtesy': 'Ms.'
	},
	{
		'Address': '7 Houndstooth Rd.',
		'City': 'London',
		'Country': 'UK',
		'EmployeeID': 9,
		'FirstName': 'Anne',
		'HireDate': '22/07/2001',
		'LastName': 'Dodsworth',
		'PostalCode': 'WG2 7LT',
		'Region': null,
		'Title': 'Sales Representative',
		'TitleOfCourtesy': 'Ms.'
	}
];
export let expenseData: Array<{[key: string]: any}>  = [
	{
		'Amount': '7',
		'Category': 'Food',
		'Description': 'Boiled peanuts',
		'FormattedDate': '06/01/2017 09:12 AM',
		'MonthFull': 'June, 2017',
		'MonthShort': 'Jun',
		'PaymentMode': 'Credit Card',
		'TransactionType': 'Expense',
		'UniqueId': 'T100001'
	},
	{
		'Amount': '8',
		'Category': 'Food',
		'Description': 'Peanuts in Coke',
		'FormattedDate': '06/04/2017 02:43 PM',
		'MonthFull': 'June, 2017',
		'MonthShort': 'Jun',
		'PaymentMode': 'Cash',
		'TransactionType': 'Expense',
		'UniqueId': 'T100024'
	},
	{
		'Amount': '11',
		'Category': 'Food',
		'Description': 'Palmetto Cheese, Mint julep',
		'FormattedDate': '06/04/2017 08:35 PM',
		'MonthFull': 'June, 2017',
		'MonthShort': 'Jun',
		'PaymentMode': 'Cash',
		'TransactionType': 'Expense',
		'UniqueId': 'T100025'
	},
	{
		'Amount': '9',
		'Category': 'Transportation',
		'Description': 'Cars and trucks, used',
		'FormattedDate': '06/04/2017 10:25 AM',
		'MonthFull': 'June, 2017',
		'MonthShort': 'Jun',
		'PaymentMode': 'Debit Card',
		'TransactionType': 'Expense',
		'UniqueId': 'T100026'
	},
	{
		'Amount': '8',
		'Category': 'Transportation',
		'Description': 'Public and other transportation',
		'FormattedDate': '06/04/2017 03:55 PM',
		'MonthFull': 'June, 2017',
		'MonthShort': 'Jun',
		'PaymentMode': 'Debit Card',
		'TransactionType': 'Expense',
		'UniqueId': 'T100027'
	},
	{
		'Amount': '160',
		'Category': 'Shopping',
		'Description': 'Household things & Utilities',
		'FormattedDate': '06/04/2017 10:22 AM',
		'MonthFull': 'June, 2017',
		'MonthShort': 'Jun',
		'PaymentMode': 'Cash',
		'TransactionType': 'Expense',
		'UniqueId': 'T100028'
	},
	{
		'Amount': '110',
		'Category': 'Extra income',
		'Description': 'Income from Sale',
		'FormattedDate': '11/30/2017 02:42 PM',
		'MonthFull': 'November, 2017',
		'MonthShort': 'Nov',
		'PaymentMode': 'Cash',
		'TransactionType': 'Income',
		'UniqueId': 'T101284'
	}
];
export let hardwareData: Array<{[key: string]: any}>  = [
	{
		'AssignedTo': 'John Doe',
		'Category': 'Laptop',
		'DOP': '04/10/2018',
		'InvoiceNo': 'INV-2878',
		'Name': 'Lenovo Yoga',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB27932009',
		'Status': 'Assigned',
		'TaskID': 1,
		'WEO': '05/01/2021'
	},
	{
		'AssignedTo': '',
		'Category': 'Others',
		'DOP': '02/12/2018',
		'InvoiceNo': 'INV-3456',
		'Name': 'Acer Aspire',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB35728290',
		'Status': 'In-repair',
		'TaskID': 2,
		'WEO': '03/01/2023'
	},
	{
		'AssignedTo': '',
		'Category': 'Laptop',
		'DOP': '04/10/2018',
		'InvoiceNo': 'INV-2763',
		'Name': 'Apple MacBook',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB35628728',
		'Status': 'In-repair',
		'TaskID': 3,
		'WEO': '04/03/2021'
	},
	{
		'AssignedTo': '',
		'Category': 'Laptop',
		'DOP': '03/09/2018',
		'InvoiceNo': 'INV-2980',
		'Name': 'Lenovo ThinkPad',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB56209872',
		'Status': 'Pending',
		'TaskID': 4,
		'WEO': '05/12/2021'
	},
	{
		'AssignedTo': 'David Anto',
		'Category': 'Laptop',
		'DOP': '01/10/2018',
		'InvoiceNo': 'INV-3782',
		'Name': 'Dell Inspiron',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB56289036',
		'Status': 'Assigned',
		'TaskID': 5,
		'WEO': '04/01/2021'
	},
	{
		'AssignedTo': 'Mary Saveley',
		'Category': 'Laptop',
		'DOP': '04/10/2018',
		'InvoiceNo': 'INV-2712',
		'Name': 'HP Pavilion',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB56289305',
		'Status': 'Assigned',
		'TaskID': 6,
		'WEO': '05/01/2021'
	},
	{
		'AssignedTo': '',
		'Category': 'Laptop',
		'DOP': '06/16/2018',
		'InvoiceNo': 'INV-0984',
		'Name': 'Asus ZenBook',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB25637891',
		'Status': 'Pending',
		'TaskID': 7,
		'WEO': '09/01/2021'
	},
	{
		'AssignedTo': '',
		'Category': 'Laptop',
		'DOP': '02/19/2018',
		'InvoiceNo': 'INV-2561',
		'Name': 'HP EliteBook',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB27819726',
		'Status': 'Ordered',
		'TaskID': 8,
		'WEO': '05/21/2021'
	},
	{
		'AssignedTo': '',
		'Category': 'Laptop',
		'DOP': '02/12/2018',
		'InvoiceNo': 'INV-8970',
		'Name': 'Apple MacBook Air',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB05262880',
		'Status': 'Pending',
		'TaskID': 9,
		'WEO': '03/01/2023'
	},
	{
		'AssignedTo': '',
		'Category': 'Tablet',
		'DOP': '04/10/2018',
		'InvoiceNo': 'INV-4555',
		'Name': 'Apple iPad Air',
		'Note': 'Remarks are noted',
		'SerialNo': 'CB45262777',
		'Status': 'Pending',
		'TaskID': 10,
		'WEO': '05/01/2021'
	}
];
import { QueryBuilderComponent } from '@syncfusion/ej2-react-querybuilder';
import * as React from 'react';
import * as ReactDom from 'react-dom';
// @ts-ignore
import { hardwareData } from '../datasource.ts';
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.columnData = [
            { field: 'TaskID', label: 'Task ID', type: 'number' },
            { field: 'Name', label: 'Name', type: 'string' },
            { field: 'Category', label: 'Category', type: 'string' },
            { field: 'SerialNo', label: 'Serial No', type: 'string' },
            { field: 'InvoiceNo', label: 'Invoice No', type: 'string' },
            { field: 'Status', label: 'Status', type: 'string' }
        ];
        this.importRules = {
            'condition': 'or',
            'rules': [{
                    'field': 'Category',
                    'label': 'Category',
                    'operator': 'equal',
                    'type': 'string',
                    'value': 'Laptop'
                }]
        };
    }
    render() {
        return (<QueryBuilderComponent width='100%' maxGroupCount={2} dataSource={hardwareData} columns={this.columnData} rule={this.importRules}/>);
    }
}
ReactDom.render(<App />, document.getElementById('querybuilder'));

You can use this property in the mobile mode to restrict the nested group creation.