Make tmux script with fish

i want to create a new tmux session but will use it in fish form like this enter image description here

After I followed this https://medium.com/@HazuliFidastian/run-tmux-automatically-on-fish-shell-2b62622661c7 my tmux has become fish, but still -sh-4.2 does not become the name of the melon_datamart directory as shown above.

enter image description here