I'm Sergey from the Youtrack team.Thank you for the post. I'm happy to help you.If you mean if you can enable the dark theme for all the users by default, then no. This is a per-user setting that should be set up for each user individually. By default, a user sees Youtrack in the white theme. Though the user can switch to the dark theme, and then this setting is saved. Among relevant requests, we have one to enable the Dark theme automatically based on the OS/browser theme: https://youtrack.jetbrains.com/issue/JT-53023 If you are interested, please feel free to vote for it, as it increases its priority and subscribes you to the email notifications. To do so, sign in to Jetbrains Youtrack and hit the thumbs-up icon.
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