Policy
Prevent changing theme
This setting disables the theme gallery in the Personalization Control Panel. If you enable this setting, users cannot change or save a theme. Elements of a theme such as the desktop background, color, sounds, and screen saver can still be changed (unless policies are set to turn them off). If you disable or do not configure this setting, there is no effect. Note: If you enable this setting but do not specify a theme using the "load a specific theme" setting, the theme defaults to whatever the user previously set or the system default.
c3ed90152e6cCPL_Personalization_DisableThemeChangeRegistry
Copy registry mappings
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoThemesTab (enabled) = 1
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoThemesTab (disabled) = 0Policy notes
This setting disables the theme gallery in the Personalization Control Panel. If you enable this setting, users cannot change or save a theme. Elements of a theme such as the desktop background, color, sounds, and screen saver can still be changed (unless policies are set to turn them off). If you disable or do not configure this setting, there is no effect. Note: If you enable this setting but do not specify a theme using the "load a specific theme" setting, the theme defaults to whatever the user previously set or the system default.