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I've recently set up an instance of Jenkins running on Kubernetes, and I've installed the Theme Manager as well as the Material, Solar, and Dark themes. However, when I go to change the theme in Configure System -> Built-In Themes, all the themes are there, however they all look exactly the same as the default, and selecting them changes nothing? Is there something that I'm missing here?

What I see in my settings

user16109434
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    same problem here. currently running Jenkins 2.346.3 inside a docker container behind a reverse-proxy – malimo Aug 17 '22 at 19:50

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It's because your browser is blocking the loading of the CSS assets (The Cross-Origin-Opener-Policy).

I run it into a container as well and when I change the Jenkins URL in the admin config to "localhost" it fix the problem.

Paul Boiseau
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  • In my case, I run Jenkins for Windows Desktop, and also suffered from this issue. I headed to "Manage Jenkins" -> "Configure System" and edited the "Jenkins Location" -> "Jenkins URL", and changed `http://localhost:/` to `http://:/` – Tal Jacob - Sir Jacques Mar 08 '23 at 09:19