Broot should be launched using a shell function (see http://github.com/Canop/broot for explanations).
The function is either missing, old or badly installed.
Can I install it now? [Y n]
y
Writing br shell function in /home/default/.local/share/broot/launcher/bash/1.

Creating link from 	/home/default/.config/broot/launcher/bash/br to 
			/home/default/.local/share/broot/launcher/bash/1.

/home/default/.zshrc successfully patched with 'source /home/default/.config/broot/launcher/bash/br'

you can make the function immediately available with

source /home/default/.zshrc