I believe this is not possible on a Cloud instance, however it is possible using a behind the firewall.
I hope this helps,
Other alternative to have the site Dashboard change would be to change the Home page, so you would be able to apply the content you want and the dashboard would be just like you did. For more information on this, you can take a look at this doc: https://confluence.atlassian.com/display/AOD/Configuring+the+Site+Home+Page
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