You will need to install a user script manager extension to install this script.
Changes the chat channel list into a horizontal list above the chat text area. Public channels button is also changed into an icon.
Check the images for preview on how it looks.
If the script doesn't work or you have problems with it send me a message on Discord, and I'll fix it.
For contact: Kronos#3657 on Discord / Kronos in-game.