How to set default theme not based on system settings?

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The issue you are facing:

I want to disable nextcloud from adapting the system settings. It is quite annoying to have the default dark mode enabled - which really doesn’t work that well - in shared links. Without disabling the accessibility app I haven’t found a way yet, trying to edit the config.php with ‘theme’ just caused errors, but i didn’t find any source which themes are available (name of the standard theme).

Where is the information about adapting the system settings stored and can I change that value without having to do this on every update?