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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
index.js
index.html
styles.css
/**
     *  querybuilder restrict columns sample
     */
        var columnData =[
        {
            field: 'EmployeeID', label: 'Employee ID', type: 'number'
        },
        { field: 'FirstName', label: 'FirstName', type: 'string' },
        { field: 'TitleOfCourtesy', label: 'Title Of Courtesy', type: 'boolean', values: ['Mr.', 'Mrs.'] },
        { field: 'Title', label: 'Title', type: 'string' },
        { field: 'HireDate', label: 'HireDate', type: 'date', format: 'dd/MM/yyyy' },
        { field: 'Country', label: 'Country', type: 'string' },
        { field: 'City', label: 'City', type: 'string' }
    ];
       var importRules = {
        'condition': 'and',
        'rules': [{
            'label': 'Employee ID',
            'field': 'EmployeeID',
            'type': 'number',
            'operator': 'equal',
            'value': 1001
        },
        {
            'label': 'Title',
            'field': 'Title',
            'type': 'string',
            'operator': 'equal',
            'value': 'Sales Manager'
        }]
    };

    var employeeData = [{
      'EmployeeID': 1,
      'FirstName': 'Nancy',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Ms.',
      'HireDate': '22/07/2001',
      'City': 'Seattle',
      'Country': 'USA'
    },
    {
      'EmployeeID': 2,
      'FirstName': 'Andrew',
      'Title': 'Vice President',
      'TitleOfCourtesy': 'Dr.',
      'HireDate': '21/04/2003',
      'City': 'Tacoma',
      'Country': 'USA'
    },
    {
      'EmployeeID': 3,
      'FirstName': 'Janet',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Ms.',
      'HireDate': '22/07/2001',
      'City': 'Kirkland',
      'Country': 'USA'
    }];
    
        var qryBldrObj = new ej.querybuilder.QueryBuilder({
            width: '70%',
            dataSource: employeeData,
            columns: columnData,
            rule: importRules,
            maxGroupCount: 2
        });
        qryBldrObj.appendTo('#querybuilder');
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Query Builder</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <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="styles.css" rel="stylesheet">
    
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="querybuilder"></div>
         <div id="property"> </div>
    </div>

<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.e-query-builder {
  margin: 0 auto;
}

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