Discord CSS Theme that makes everything more compact.
If the window size is less than 960px it will change its style to a more compact version. If it's less than 480px then the server and channel panels will disappear! (See in preview)
Add the following code lines to ...\AppData\Roaming\discord\settings.json
:
"MIN_WIDTH": 480, "MIN_HEIGHT": 440
Either use BeautifulDiscord or BetterDiscord to apply the theme. They have their theme installation tutorials... I think.