If I have two or more connection windows open (and tabbed), the 'X' button disappears so I can't quick-close them (have to right-click --> close, or to to the File menu).
I also noticed the position of the 'Close' option in the right-click menu of the connection window changes depending on if there is 1 or multiple windows open and tabbed together.
Single window: Close is first option
Multiple windows: Close is the last (bottom) option
It's probably better to keep the position consistent.
Yep, that's a limit of the 3rd party Window Docking component that I'm using in TeSSH. The Close button isn't shown when tabs are present. I try to make the window more consistent...last (bottom) is where it should be.
I can also put a close button on each tab itself if you think that would be useful. I generally avoided that because it makes it too easy to accidentally close a session.