Switch Accounts option allows the users to switch to another account to access and manage projects that they have been given access to. The main purpose of doing so is to avoid maintaining multiple owners' projects under a single account. This also provides easier visualization of the projects.
Click on the Switch Account icon from the left Navigation bar.
Select the account to switch to from the pop-up dialog box:
Now the user can access projects under the Switched account that he has been given access to.