CS:GO Console Commands List
How to Hide Your Online Status in WhatsApp
Any way to mute gotv chat? : GlobalOffensive
How to Disable Chat in Minecraft [All Versions]
However, you cannot play a full-screen game while popping out your Twitch chat as it will not be overlaid with it.
You can try it by set of commands.
A CS:GO demo is recorded in-game material that can be watched again like a replay.