The red dot on Discord icon can be disabled by turning off notifications. Here is how you can do it: Open Discord and click on the Gear icon to open User Settings.

The red dot on Discord icon usually appears on the application and on taskbar as well. If you see a red dot on Discord icon it simply means that a notification or a new message is unread.

Find the icon of the server whose notifications you want to mute in your server list and right-click on it. 2. Select Mute Server and pick how long you'd like to mute it for.