Ghostty has a hard-to-find "quake mode" that may interest some. During the beta I had it configured like this on macOS: keybind = global:cmd+space=toggle_quick_terminal quick-terminal-animation-duration = 0.1 There isn't an option to set the default height of the "quick terminal" window that I'm aware of but you can drag the bottom of the window after it opens and it will persist between toggles.
Doesn't seem to like that keybind now, and searching the docs doesn't give me answer. Do you know if something still works? Also, why cmd+space? That's the MacOS spotlight search binding.
You could try another keybind:
https://ghostty.org/docs/config/reference#keybind
Also be sure to quit and reopen Ghostty or use the reload configuration option from the Ghostty menu.