Active Backdrop background and image size globally for all user

[kfdlean 0]

Hello,

I have a question regarding the “Show background images” display option. When this setting is enabled, which file in the system folder is modified?

To give you some context: I enable this option on my server because it improves the overall appearance. However, for some reason, it automatically disables itself for all user accounts. As a result, I have to manually re-enable this setting for every user, which is quite inconvenient. Same thing for the image size.

If I knew where this option is configured at the system level, it might be possible to enable it by default. I assume there must be a variable that determines whether this option is disabled by default, correct?

Thank you in advance for your help.