In a recent version of Composer, you could dock it to the terminal area.
The interface changed in Cursor update 0.39.0 in order to add some features users were requesting, such as modified file navigation and composer chat history etc.
A couple of versions back it looked like this.
I really like Composer, and the direction it’s heading in, but I find I am constantly resizing, moving, hiding, minimising, maximising the window. I also find the Ctrl + L sidebar chat panel ‘gets in the way’ of the Editor. I’d love to be able to drag both Composer and Ctrl + L chat to another screen, and have them maximised. Then I could have my AI on one screen and the Editor on the other.