This article explains how to change your personal X (formerly Twitter) background and your X profile background photo.
How to Change Twitter Display Color and Twitter Dark Mode
If you’re an avid X user and find the white background impressive, it’s possible to switch to a darker background that lends itself well to nighttime use. Here’s how to switch to an X black background when it suits you.
Click on Settings and privacy.
Click on Accessibility, display and languages.
