Prevent Changing the Desktop Background
User Configuration > Administrative Templates > Control Panel > Personalization
3.
On the right, scroll down and double-select thePrevent changing desktop backgroundpolicy.
On the next Window, select theEnabledoption.

Once done, choose theApplybutton and then onOk.
This will block the wallpaper-changing option on your Windows 11.
Now the background option on the Personalization page will show Some of these options.

Doing so will restrict access to the desktop background controls and prevent users from changing the wallpapers.
Heres what you’re gonna wanna do.
User Configuration > Administrative Templates > Desktop > Desktop
3.

On the right pane, find and double-choose theDesktop Wallpaperoption.
Next, on the Desktop Wallpaper policy, selectEnabled.
Once done,enter the local path of the wallpaperyou want to set in the Wallpaper Name field.

After making the changes, click theApplybutton and then clickOK.
This will prevent others from accessing the desktop background configs in Windows 11.
These are the two best ways to prevent others from changing the desktop background in Windows 11.

Select Not Configured in Step 4 on both methods if you want to change the wallpaper again.
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