Open Preferences > Plugins, search for insomnia-plugin-theme-omni and click Install Plugin;
After that, go to Themes (also under preferences) and apply the Omni theme.

Package not found: If the installation fails because of an error saying it did not find the package, it may be because of a bug that happens when installing Insomnia on Linux with Snap. To fix it, take a look at this comment.

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