Background, colors, lock screen, taskbar, Start menu, and themes.
Background & Lock Screen
Wallpaper (solid, picture, slideshow), lock screen image or spotlight. Lock screen app status allows up to 7 apps to show brief info (battery, email count). ms-settings:personalization-background
Colors & Themes
Light/dark mode (system and per-app), accent color, transparency effects. Full themes bundle wallpaper, colors, sounds, cursor. Windows 11 adds round corners as a system-level design choice.
Taskbar
Pin apps, move taskbar (Win 10 only — Win 11 locks to bottom), combine buttons, show/hide system tray icons. Notification area icon visibility. ms-settings:taskbar
Start Menu
Number of recent items, show app list, show recently opened files, folder shortcuts on Start. Windows 11 layouts: Default, More Pins, More Recommendations. ms-settings:personalization-start
Fonts
Browse and install fonts (drag font file into Settings or Microsoft Store). Replaces old Control Panel → Fonts folder for most installs. ms-settings:fonts
Device Usage (Win 11)
New in Win 11: tag device use case (gaming, creativity, business) to get tailored Microsoft Store recommendations. Does not change OS behavior.