The cursor shape can be one of block, beam, underline. Note that when reloading the config this will be changed only if the cursor shape has not been set by the program running in the terminal. This sets the default cursor shape, applications running in the terminal can override it. In particular, shell integration in kitty sets the cursor shape to beam at shell prompts. You can avoid this by setting shell_integration to no-cursor.

I have shell_integration no-cursor no-title in my config. And when I use launch --hold cat, I see the cursor is underline as expected but when I ctrl-c it becomes block. So it's overridden by something else?