It's about the "colors of the servers in that table/list".
Please be more specific about how it does not satisfy your needs.

This is not what I imagined, I meant the colors of the servers in this table.

See https://winscp.net/eng/docs/ui_login_advanced#color

It would be useful to color differentiated the servers in the login dialog list. For example, I might choose red for work servers and green for personal servers.

Thanks