Webmin is a web-based system administration tool that provides a graphical interface for managing and configuring various aspects of a server. It does not have any built-in themes or skins that mimic the look and feel of other control panel systems, such as Plesk.
However, you can customize the appearance of Webmin by modifying the HTML and CSS code of the Webmin interface. You can find the HTML and CSS files for the Webmin interface in the /usr/share/webmin/miniserv/ directory on your server.
It's important to note that modifying the HTML and CSS code of the Webmin interface can be a complex and time-consuming process. It is recommended to have a good understanding of HTML, CSS, and web design before attempting to customize the Webmin interface. Consult the Webmin documentation and online resources for more information on customizing the appearance of Webmin.
You may also be able to find third-party themes or skins for Webmin that mimic the look and feel of other control panel systems, such as Plesk. These themes can be downloaded and installed through the Webmin interface. Consult online resources for more information on available Webmin themes.