You can Shift-Duplicate the current session into a new window, modify it as you like for your temporary needs and close, coming back to your previous window.v

When I close WinSCP it will remember the position of the window and the next time I open WinSCP it will open at the position I closed it.

This could be handy, but I do prefer to have an option in the menu to save position.
Now I can move around WinSCP without thinking that I need to move WinSCP back to the position I want it before I close it.

Now I know it will always open on the same position on the screen and if I change the window size or position I can always quit WinSCP and start it again and everything is back as I want it.