How to change Discord background Theme?

There are three options at the top that can determine your Theme: Dark, Light, and Sync with computer. Dark theme will make the entire client’s interface a dark grey/charcoal color with white as the default text color.  Alternatively, Light theme will make your client a white color with dark grey as the default text color. With the Light theme, you can also enable Dark Sidebar. Sync with computer, or Automatic for iOS mobile devices, will sync your Discord client’s appearance with your device’s appearance setting.

You can click on the “Uninstall” button under BetterDiscord’s theme settings to remove a Discord theme from the app. alternatively, you can also choose to disable the toggle to temporarily remove your Discord theme.