Selenium run same test on different platforms in parallel

Question

I have three classes with different tests that I want to execute on chrome browser. The most important thing is that I want to run in parallel on Windows and macOS. How should I do it on Selenium 4 with Hub - > node setup?

My testng file looks like this

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
<suite name="Suite 1" parallel="classes" verbose="1" >

    <test name="Test windows and macOS">
        <classes>
            <class name="test1"/>
            <class name="test2"/>
            <class name="test3"/>
        </classes>
    </test>
</suite>

When test is executed tests are running only on Windows with two browser windows. Selenium documentation doesn't explain how to do this.