How to Use Discord's Text Chat in Voice Channels?

Traditionally, most Discord servers had to have individual text channels for each voice channel. This was so that the people speaking in that voice channel could share text and files without causing chaos in the main text channels.

Discord has a feature to tidy things up, all voice channels have a built-in text chat. These text chats only appear when you click the icon in the voice channel, and don't take up space next to the regular text channels. This makes them more accessible for people who are in the voice channel, and also doesn't crowd the channels list in the server.