To select a specific site in your account (i.e. knowledge base), follow these instructions.
Click the dropdown
Select the site you want to work on
The number of sites you see will depend on how many sites you have created on your account, and how many sites you have permission to edit.
Manage content in your site
Now you can manage your content in your site.
Collapsing the list of manuals can make it easier to navigate to the other areas of your site.
Click on Manuals
Manuals are hidden
To bring back the manuals, simply click on Manuals again.