[1.19.2 Version] How do I make my custom Zombie that uses biped model to hold up its arms like regular Zombies

Now that Mcreator has merged the biped and zombie model to be the same model, how do I actually make the biped mob to hold up its arms like regular Zombies?? I tried putting the Zombie as the base AI but that still doesn't work.

My zombie is on the left side.