:vs to open a window. If I want this window to be the leftmost window, no matter what the currently active window is, how can I do it?
You can use a couple of methods to achieve the same end result as your request.
You can just open a vertical split and then move it to leftmost position using Controlw + ShiftH (note that the "h" is uppercase.) See
:help CTRL-W_Hfor more information.
You can use
:topleftto modify your
:vscommand to open the window in the leftmost position. You can use the following command for that: