Configuring default CSS is not working as expected.Issue The users are unable to set a default theme for the instance. Even after following the documentation for theme management, it is not working as expected. https://docs.servicenow.com/bundle/quebec-platform-user-interface/page/administer/navigation-and-ui/task/t_ConfigureACompanyTheme.htmlReleaseAllCauseThe settings that are specified in the docs will be applied only if the theme 'system' is selected in the system settings(Click on the gear icon at the top right corner).ResolutionFor the default theme to apply make sure theme 'system' is selected in the system settings. -->Click on the gear icon at the top right corner in the home page. -->Go to the theme and select 'System'.