i recently changed (but i don’t know how) the login/signup page from my store, and my question is “There is a way to go back to my previously page or to switch manually back?”.
I am not 100% clear on what exactly you are trying to achieve - are you hoping to login to a different store/account you have under this email address? Or are you referring to customer login within this store?
Any clarification on this would be really useful for me - thanks!