Hide tab close buttons not only when tabs get too small. Always, and to close tabs by right click menu.
Let me explain the situation. Working with at least 20 servers, each have some path open and I look down in the content and switch to each tab rapidly to find something. Even when X is at some distance, because I go from left to right or right to left through all tabs with pretty high click rate, it's almost sure I hit an X somewhere in the middle of my work.

Ok, in this case, hiding the close button might be an improvement.

I have added this request to the tracker:
Issue 2479 – Hide tab close buttons when tabs get too small
You can vote for it there.

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Though the "all the top bar of the window is just X X X X X with tiny spaces" is imo bit exaggeration :)

screenshot with many tabs with X close

@mregister: Please post a screenshot.

@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.

Since WinSCP 5.14 (2018), you can use the close button to close a non-active disconnected session without a need to reconnect it.
Issue 1393 – Close button on session tab
https://winscp.net/eng/docs/ui_tabs

@martin A surprising request found! Please do it, I am struggling daily with lost paths.
Other multi-tabbed programs have it.
Greetings!
M

+1 for this feature.

Thanks for your feedback. I'll consider improving this.

If I opened a work-space with multiple tabs, and wishes to close few unwanted ones , there is no option to close it directly. Users hopes there exists a "close tab" option when he click the right button, because this is followed by all major browsers. But WinSCP tries to connect to the server when the user "right" clicks first time, and wants to wait until it finishes before disconnecting :(