Dual monitors - extend desktop

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http://askubuntu.com – I have ubuntu 12.04 on my laptop, and I have an external monitor connected to my system. I have enabled the second monitor from the "Displays..." menu (btw, is there a way to make external monitors enabled by default? ) and it extends as one large workspace. My typical use is: external monitor plays a movie, series, streams video etc, and I work on the laptop's monitor. The problem is, when I click anywhere in my laptop display, the unity bar is also shown on the monitor that plays videos, which can be pretty annoying. Is there any way I can make my life better - turn of unity bar and the (HowTos)