Restart Agent as
The "Restart Agent as..." menu item is available on the toolbar in Full Control and View connection mode. It only becomes visible if the remote Agent is running under a non-administrative Windows user account.

When you select this menu item, you are prompted with a dialog where you must enter user credentials:

When to use
If you know administrator credentials for the remote machine, use this feature to restart the Agent as administrator. This will let you control the UAC prompts on the remote computer when you install software or perform other actions that require administrative access.
Please, note that with the Host running on the remote machine you can remotely control UAC prompts right away without any additional commands. However, unlike Agent the Host requires administrative privileges to install.