User Guide

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Your HDMI monitor would mirror your iPad Pro.
Chrome OS
You can refer the following links about how to set.
https://support.google.com/pixelbook/answer/9134069?hl=en
https://support.google.com/chromebook/answer/1060909?hl=en
4.Sound issues
macOS
You can go to Apple icon

System Preferences

Sound

Output, choose your TV as the
sound output. Or you can choose your built-in speaker as the sound output per your
requirements.
SONY TV
Launchpad  Other  Audio MIDI Setup  DisplayPort  Output  please choose 2 ch 16-bit
Integer, then your TV would have sound.
Windows 10 laptop
You can right-click the audio icon on the right-bottom

Open Sound
Settings

Sound

OutputChoose your corresponding TV as the sound output.(Windows
10 Pro 1903 just for your reference)
iPad Pro with USB-C port
When you were watching online video, sound would pass through from your iPad Pro to
your TV automatically.