The layout should be specified on the layout: line. But you are not limited to five predefined layouts (such as main-vertical). On the page :
In addition, select-layout may be used to apply a previously used layout - the list-windows command displays the layout of each window in a form suitable for use with select-layout. For example: $ tmux list-windows 0: ksh [159x48] layout: bb62,159x48,0,0{79x48,0,0,79x48,80,0} $ tmux select-layout bb62,159x48,0,0{79x48,0,0,79x48,80,0} tmux automatically adjusts the size of the layout for the current window size. Note that a layout cannot be applied to a window with more panes than that from which the layout was originally defined.
First, customize your layout exactly as you like - you can adjust the width with resize-pane until it suits you. Then run tmux list-windows . And then you should be able to use the layout: line from the unchanged result in tmuxinator.conf
So based on the results of your entities:
0: tmux [208x73] [layout b147,208x73,0,0[208x62,0,0,208x10,0,63{104x10,0,63,103x10,105,63}]] (active)
The corresponding section of the confmax file should be:
- editor: layout: b147,208x73,0,0[208x62,0,0,208x10,0,63{104x10,0,63,103x10,105,63}] panes: - vim -