@martin I wanted to say the opposite, I'm not sure why I posted here and not in that other ticket somebody begging you to remove the X from the tabs. I have the same issue, I use 10–20 tabs, all the top bar of the window is just X X X X X with tiny spaces. I'm constantly closing unwanted tabs and search after for minutes what tab was that.
MTPuTTY have a very nice implementation. No X on any tab, but still can be closed Alt+F4 or right click Close. With WinSCP all my day is a nightmare. Otherwise it's feature rich, just that X makes me pull out all my hair.