Problems joining a window to an existing container

[pwntester]

Hi,

Im trying to achieve the following layout:

h_tiles

• v_accordion
  ---- window 1
  ---- window 2
  ---- window 3
• window 4

I start with:
h_tiles

• window 1
• window 2
• window 3
• window 4

And from the right window (window 3), I join it with left so I get:

h_tiles

• window 1
• v_tiles
  ---- window 2
  ---- window 3
• window 4

I move to window 1 and join it with the right trying to get:

h_tiles

• v_tiles
  ---- window 1
  ---- window 2
  ---- window 3
• window 4

But instead I get

h_tiles

• h_tiles
  ---- window 1
  ---- h_tiles
  ------ window 2
  ------ window 3
• window 4

How can I join window 1 to the container of window 2 and 3?

Thanks