There are two locations where you can see a listing of campaigns. 

The first way is under the Campaign Management tab. On the orange colored bar, click on the name of the campaign that you are currently on. A drop down menu will appear that will list all of your campaigns.

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Note: If you have more than one campaign, you'll be able to see all available campaign by clicking on the campaign name next to the small suitcase icon on that colored bar. 

The second way to view all of your campaigns is under the Organization tab. From there, select the "Campaign List" option.
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Note: This tab allows you to copy, export, hide and even remove campaigns.