Dashboard background color issue

For version 7.1.1, the background color of the dashboard cannot change to "dark" although the setting is changed as shown below:

Can anyone help on this?

@June I think that is when creating a new dashboard

If you are on version 7.0.0, you can also switch Kibana to dark-theme and just reload your page.

Set theme:darkMode to true. https://www.elastic.co/guide/en/kibana/current/advanced-options.html