This is a very popular request in education where you may want to hide a subset of SharePoint Online functionality such as newsfeeds or sites for example. The good news is we now just shipped this update to SharePoint Online that provides this capability to toggle on and off SharePoint features in the Portal navigation bar:

Where is this feature?:

1) Visit Office 365 portal

2) Visit ‘SharePoint’ administration

3) Visit ‘Settings’

4) Select features to enable/disable within the navigation bar

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Portal Nav bar before toggle:

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Portal Nav bar after toggle hiding Newsfeed and Sites (note must exit browser fully and restart):

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