Have you checked these first?
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Help us help you: include your environment details. We've made this easy for you. Use the Copy System Info button in Admin Panel › osAwesome › Diagnostics, then paste below.
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Hello,
We would like to work with dark mode, but no agent can activate it nor do any of the settings tabs work, only the first one in Account, please see image:

It doesn't matter if the agent is an administrator or not, no matter how you configure it, those tabs don't work
We have the osTicket (v1.17.5) v2 version installed
Regards
I have already discovered why it does not work, if you enable the Spanish language those tabs stop working, if you enable the English language, then the 4 tabs already work. I don't know if this also happens with other languages, but keep it in mind, greetings
By the way, it happens in version 1.17 and 1.18, likewise, it's not a PHP server issue
I have verified it in both cases
Regards