Why can't i see my files when i connect to my lcd projector?

after i upgraded to Yosemite, i connected my laptop to my projector using the apple adapter. once i connected the only thing i could see was the picture i have on my desktop. I couldn't see any of my files or folders. when i opened a web browser, i couldn't see it on the projector screen. I could see all of these things on my laptop screen, but it is not projecting anything, just my desktop picture. what can i do to be able to use my laptop when it is connected to my projector?

Did you turn on mirroring?
Also
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support

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