On discord you have a few options to get rid of some of the channels that you are not interested into.
- If it is a channel that you NEVER want to read, got to the top of the server channel sidebar and click on the chevron (or "..." for mobile users) and uncheck the options "Show All Channels". After that you will see on the top of the channel list a new option called "Browse Channels", that will allow you to hide channels.
- If it is a channel that you don't want to get highlighted bold, but still want to read from time to time, right click (or touch hold on mobile) on the channel (or category) and click on Mute Channel > Until I turn it back on. Doing that will make the channel never highlight for you with the bold text. Also, muted channels stay hidden when you collapse a category. Example: If you mute the entire "Vine Chat" category and click on the category name it will hide all the channels inside until you click at the name again to expand.
- If you don't wanna see the sound icons related to the Music and Voice channels you can go to 📌・dashboard and click on "Hide/Show Audio Channels" > and hide the Music Stage and/or Voice Chat.