Unable to find toggle 'zoom' keybind - Apex Legends

By default when you pick up the 2x-4x types of scope in-game(or any variable scope) you can change from 2x to 4x by pressing shift but I have been using shift for crouching and meaning I cant use the toggle zoom button at all! It would be helpful if that 'toggle zoom keybind' could be implemented in the game settings!