If you want to change your background, sounds, and accent colors all at once, go to Settings > Personalization > Themes .
Changing your screen background in is a quick way to personalize your workspace. Whether you want a single stunning photo, a rotating slideshow, or a clean solid color, the operating system offers several built-in methods to refresh your desktop and lock screen. Primary Method: Using Personalization Settings how to change screen background on windows 11
If you meant you wanted to make your text "solid" (bolder) or change the text size on the background: If you want to change your background, sounds,