background colour

Previously I have set custom background colour for every server. (user interface /commander)
Now I have added another server, but when I set new color (options/color) my settings are not saved and background is still default (white).
How can I set and save it?

[winscp 5.5.4 build 4433]

You have to edit the color on Login dialog.
See https://winscp.net/eng/docs/task_connections#session_color
Or, after you change the color of opened site, explicitly save it by going to Session > Save Session as Site (overwriting your existing site).

Request to save session color implicitly is tracked here:
https://winscp.net/tracker/895

Working great.
Thank you !