Is this the MultiWindow bar you're referring to?
Tapping and holding the Back Button should 'get rid of it' (press and hold again and it comes back). It allows you to see which apps are available for MultiWindow operation and open them in that mode.
Are you running a launcher? It looks like favorite apps menu for some launchers. You will have to check launcher settings to see how to move or get rid of it.
Are you running a launcher? It looks like favorite apps menu for some launchers. You will have to check launcher settings to see how to move or get rid of it.