You can hide the application header by adding the appheader=false parameter to the data feed URL in the following form.
http://<url to dashboard>?appheader=false
In addition, you can display a drop-down menu in the data feed which provides zoom, help and logout options. The menu icon is displayed in the top right corner. Add the showmenu=true parameter to the data feed URL in the following form.
http://<url to dashboard>?appheader=false&showmenu=true
The data feed is displayed without the application header in the feed editor.