Does it always just split the most recently opened window? Do you have to open them in a specific order to get the sizes you want? Browser first, terminal third, etc?
There are multiple different default layouts and you can even define your own custom layouts[1] and set rules on when to activate them[2].
In any layout, you can always use the `komorebic.exe move <OPERATION_DIRECTION>` command to place a window in the desired tile to achieve the desired size.