You apply a theme to a SharePoint Online site by using the Change the look option in Site Settings. However, when you view the SharePoint Online site, the Office 365 top navigation bar uses the theme that's configured for the organization, not the theme that's configured for the site.
Based on customer requests, changes were recently made to SharePoint Online that let SharePoint Online sites use the Office 365 theme that's configured for the organization. Microsoft is working at letting you disable this feature for an organization so that the top navigation bar will use the theme from the site collection. We will update this article when more information is available.
ID articolo: 3094430 - Ultima revisione: 21 dic 2016 - Revisione: 1