This request is tracked here:
https://winscp.net/tracker/1000

Meanwhile you can hold does Shift key to open session in new window:
https://winscp.net/eng/docs/ui_jump_list

(WinSCP 5.5.3, Windows 7 SP1.)

Just upgraded from 5.1.1.

Previously if I had several WinSCP sessions launched separately connecting to several different machines, each showed its own taskbar entry (I have my Taskbar buttons set to "Never combine"). Now, I see only a single WinSCP in the taskbar, and tabs within WinSCP for each session.

I want the previous behavior - I want to select a given WinSCP session from the taskbar, not by tabs within a single WinSCP session.

I don't see a configuration item for that. How do I do it?

If it can't be done I'll have to revert to an earlier version - when was this changed? I don't see mention in the changelog or FAQ.