How to hide/ show symbols on the made stage or scene

Hi i need help in adobe animate I created a created a symbol called human with in that human symbol, human i created layers of all different parts the head torso etc... so they is a layer i made for front and back arms I turned off the eye for the front arms so that when import my human symbol to the main stage, front arms wont show but sadly the front arms are showing someone told me i can hide these arms you using the alpha option if it is a graphic but i dont know where to find the option called Alpha in adobe animate Can any help if someone knows this solution on how to hide some layers within a symbol when imported on stage thank you