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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.component.ts
app.module.ts
datasource.ts
main.ts
import { Component, OnInit } from '@angular/core';
import { RuleModel } from '@syncfusion/ej2-angular-querybuilder';
import { hardwareData } from './datasource';

@Component({
    selector: 'app-root',
    template: `<!-- To render Query Builder. -->
               <ejs-querybuilder #querybuilder width="70%" [dataSource]="data" [rule]="importRules" maxGroupCount=2>
                <e-columns>
                  <e-column field="TaskID" label="Task ID" type="number"></e-column>
                  <e-column field="Name" label="Name" type="string"></e-column>
                  <e-column field="Category" label="Category" type="string"></e-column>
                  <e-column field="SerialNo" label="SerialNo" type="string"></e-column>
                  <e-column field="InvoiceNo" label="InvoiceNo" type="string"></e-column>
                  <e-column field="Status" label="Status" type="string"></e-column>
                </e-columns>
              </ejs-querybuilder>`
})

export class AppComponent implements OnInit {
    public data: Object[];
    public importRules: RuleModel;
    ngOnInit(): void {
        this.data = hardwareData;
        this.importRules = {
        'condition': 'or',
        'rules': [{
            'label': 'Category',
            'field': 'Category',
            'type': 'string',
            'operator': 'equal',
            'value': 'Laptop'
        }]
    };
    }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { QueryBuilderModule } from '@syncfusion/ej2-angular-querybuilder';
import { AppComponent } from './app.component';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        QueryBuilderModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }
/**
 * QueryBuilder datasource
 */
export let employeeData: Object[] = [{
  'EmployeeID': 1,
  'LastName': 'Davolio',
  'FirstName': 'Nancy',
  'Title': 'Sales Representative',
  'TitleOfCourtesy': 'Ms.',
  'Date': '12/10/2018',
  'Address': '507 - 20th Ave. E.\r\nApt. 2A',
  'City': 'Seattle',
  'Region': 'WA',
  'PostalCode': '98122',
  'Country': 'USA'
},
{
  'EmployeeID': 2,
  'LastName': 'Fuller',
  'FirstName': 'Andrew',
  'Title': 'Vice President',
  'TitleOfCourtesy': 'Dr.',
  'Date': '22/06/2018',
  'Address': '908 W. Capital Way',
  'City': 'Tacoma',
  'Region': 'WA',
  'PostalCode': '98401',
  'Country': 'USA'
},
{
  'EmployeeID': 3,
  'LastName': 'Leverling',
  'FirstName': 'Janet',
  'Title': 'Sales Representative',
  'TitleOfCourtesy': 'Ms.',
  'Date': '12/10/2011',
  'Address': '722 Moss Bay Blvd.',
  'City': 'Kirkland',
  'Region': 'WA',
  'PostalCode': '98033',
  'Country': 'USA'
},
{
  'EmployeeID': 4,
  'LastName': 'Peacock',
  'FirstName': 'Margaret',
  'Title': 'Sales Representative',
  'TitleOfCourtesy': 'Mrs.',
  'Date': '01/11/2014',
  'Address': '4110 Old Redmond Rd.',
  'City': 'Redmond',
  'Region': 'WA',
  'PostalCode': '98052',
  'Country': 'USA'
},
{
  'EmployeeID': 5,
  'LastName': 'Buchanan',
  'FirstName': 'Steven',
  'Title': 'Sales Manager',
  'TitleOfCourtesy': 'Mr.',
  'Date': '12/10/2018',
  'Address': '14 Garrett Hill',
  'City': 'London',
  'Region': null,
  'PostalCode':
  'SW1 8JR',
  'Country': 'UK'
},
{
  'EmployeeID': 6,
  'LastName': 'Suyama',
  'FirstName': 'Michael',
  'Title': 'Sales Representative',
  'TitleOfCourtesy': 'Mr.',
  'Date': '01/12/2018',
  'Address': 'Coventry House\r\nMiner Rd.',
  'City': 'London',
  'Region': null,
  'PostalCode': 'EC2 7JR',
  'Country': 'UK'
},
{
  'EmployeeID': 7,
  'LastName': 'King',
  'FirstName': 'Robert',
  'Title': 'Sales Representative',
  'TitleOfCourtesy': 'Mr.',
  'Date': '12/12/2011',
  'Address': 'Edgeham Hollow\r\nWinchester Way',
  'City': 'London',
  'Region': null,
  'PostalCode': 'RG1 9SP',
  'Country': 'UK'
},
{
  'EmployeeID': 8,
  'LastName': 'Callahan',
  'FirstName': 'Laura',
  'Title': 'Inside Sales Coordinator',
  'Date': '12/10/2012',
  'TitleOfCourtesy': 'Ms.',
  'Address': '4726 - 11th Ave. N.E.',
  'City': 'Seattle',
  'Region': 'WA',
  'PostalCode': '98105',
  'Country': 'USA'
},
{
  'EmployeeID': 9,
  'LastName': 'Dodsworth',
  'FirstName': 'Anne',
  'Title': 'Sales Representative',
  'TitleOfCourtesy': 'Ms.',
  'Date': '12/03/2018',
  'Address': '7 Houndstooth Rd.',
  'City': 'London',
  'Region': null,
  'PostalCode': 'WG2 7LT',
  'Country': 'UK'
}];
export let expenseData: Object[]  = [{
    'UniqueId': 'T100001',
    'Category': 'Food',
    'PaymentMode': 'Credit Card',
    'TransactionType': 'Expense',
    'Description': 'Boiled peanuts',
    'Amount': '7',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/01/2017 09:12 AM'
  }, {
    'UniqueId': 'T100024',
    'Category': 'Food',
    'PaymentMode': 'Cash',
    'TransactionType': 'Expense',
    'Description': 'Peanuts in Coke',
    'Amount': '8',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 02:43 PM'
  }, {
    'UniqueId': 'T100025',
    'Category': 'Food',
    'PaymentMode': 'Cash',
    'TransactionType': 'Expense',
    'Description': 'Palmetto Cheese, Mint julep',
    'Amount': '11',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 08:35 PM'
  }, {
    'UniqueId': 'T100026',
    'Category': 'Transportation',
    'PaymentMode': 'Debit Card',
    'TransactionType': 'Expense',
    'Description': 'Cars and trucks, used',
    'Amount': '9',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 10:25 AM'
  }, {
    'UniqueId': 'T100027',
    'Category': 'Transportation',
    'PaymentMode': 'Debit Card',
    'TransactionType': 'Expense',
    'Description': 'Public and other transportation',
    'Amount': '8',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 03:55 PM'
  }, {
    'UniqueId': 'T100028',
    'Category': 'Shopping',
    'PaymentMode': 'Cash',
    'TransactionType': 'Expense',
    'Description': 'Household things \u0026 Utilities',
    'Amount': '160',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 10:22 AM'
  },
{
    'UniqueId': 'T101284',
    'Category': 'Extra income',
    'PaymentMode': 'Cash',
    'TransactionType': 'Income',
    'Description': 'Income from Sale',
    'Amount': '110',
    'MonthShort': 'Nov',
    'MonthFull': 'November, 2017',
    'FormattedDate': '11/30/2017 02:42 PM'
  }];
  export let hardwareData: Object[]  = [
    {
        'TaskID': 1,
        'Name': 'Lenovo Yoga',
        'Category': 'Laptop',
        'SerialNo': 'CB27932009',
        'InvoiceNo': 'INV-2878',
        'DOP': '04/10/2018',
        'WEO': '05/01/2021',
        'Status': 'Assigned',
        'AssignedTo': 'John Doe',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 2,
        'Name': 'Acer Aspire',
        'Category': 'Others',
        'SerialNo': 'CB35728290',
        'InvoiceNo': 'INV-3456',
        'DOP': '02/12/2018',
        'WEO': '03/01/2023',
        'Status': 'In-repair',
        'AssignedTo': '',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 3,
        'Name': 'Apple MacBook',
        'Category': 'Laptop',
        'SerialNo': 'CB35628728',
        'InvoiceNo': 'INV-2763',
        'DOP': '04/10/2018',
        'WEO': '04/03/2021',
        'Status': 'In-repair',
        'AssignedTo': '',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 4,
        'Name': 'Lenovo ThinkPad',
        'Category': 'Laptop',
        'SerialNo': 'CB56209872',
        'InvoiceNo': 'INV-2980',
        'DOP': '03/09/2018',
        'WEO': '05/12/2021',
        'Status': 'Pending',
        'AssignedTo': '',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 5,
        'Name': 'Dell Inspiron',
        'Category': 'Laptop',
        'SerialNo': 'CB56289036',
        'InvoiceNo': 'INV-3782',
        'DOP': '01/10/2018',
        'WEO': '04/01/2021',
        'Status': 'Assigned',
        'AssignedTo': 'David Anto',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 6,
        'Name': 'HP Pavilion',
        'Category': 'Laptop',
        'SerialNo': 'CB56289305',
        'InvoiceNo': 'INV-2712',
        'DOP': '04/10/2018',
        'WEO': '05/01/2021',
        'Status': 'Assigned',
        'AssignedTo': 'Mary Saveley',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 7,
        'Name': 'Asus ZenBook',
        'Category': 'Laptop',
        'SerialNo': 'CB25637891',
        'InvoiceNo': 'INV-0984',
        'DOP': '06/16/2018',
        'WEO': '09/01/2021',
        'Status': 'Pending',
        'AssignedTo': '',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 8,
        'Name': 'HP EliteBook',
        'Category': 'Laptop',
        'SerialNo': 'CB27819726',
        'InvoiceNo': 'INV-2561',
        'DOP': '02/19/2018',
        'WEO': '05/21/2021',
        'Status': 'Ordered',
        'AssignedTo': '',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 9,
        'Name': 'Apple MacBook Air',
        'Category': 'Laptop',
        'SerialNo': 'CB05262880',
        'InvoiceNo': 'INV-8970',
        'DOP': '02/12/2018',
        'WEO': '03/01/2023',
        'Status': 'Pending',
        'AssignedTo': '',
        'Note': 'Remarks are noted'
    },
    {
        'TaskID': 10,
        'Name': 'Apple iPad Air',
        'Category': 'Tablet',
        'SerialNo': 'CB45262777',
        'InvoiceNo': 'INV-4555',
        'DOP': '04/10/2018',
        'WEO': '05/01/2021',
        'Status': 'Pending',
        'AssignedTo': '',
        'Note': 'Remarks are noted'
    }
];
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

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