Plesk allows you to customize the panel branding including the title bar and the logo you and your client see.

To do this, go into Tools & Utilities

Click Control Panel Branding

- Untick Use Default
- Type text into the "The Panel title bar text" field
- Browse for a image to use for the logo through the "Choose File" button.
- If you ever want to revert the logo, click the Default Logo button.
- Press OK
- That's it! Your Plesk Control Panel is now customized.