Okay... We're NOT talking about the same thing here... YOU don't have that many options... If you change something in YOUR profile settings and it doesn't work out, you simply go back and change it back to the other option... Most of the options available to the User are ON/OFF options... An example... If you want to receive email notifications, you simply turn the option ON... If that doesn't work out, you turn the option OFF... On the other hand, the email option in the forum software that is only available to the administrator may be a full page of a dozen different options in order for that feature to work...
There is no option in your profile to reset to a default, that I am aware of... on the other hand, if something doesn't work or seem right to you, there are members here that can help you determine which settings will best suit your needs.