3/ Your progress bar mostly shows full width because your value for progress bar is 400 https://prnt.sc/b-p4BnljabuY so once customer buys your items for more than 400₪ then progress bar is full. Otherwise, if I have less than 400₪ then progress bar is shown required value of money to spend to get free shipping -> https://prnt.sc/Z2d1lzWQK1pE. Also, you should configurate your cart/checkout progress bar settings -> https://prnt.sc/0_aQq6qo658n
