- 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.