Please scroll to bottom and click "Try this" to see preview of builder setting.
What is Front-end Builder Account ?
Practically, a front-end builder account is a customer account. This type of account allows users/ customers to login right at the front-end in order to make proper adjustment on CMS pages of the website.
A front-end builder account differentiates it from a normal user account in term of permission setting in backend panel. As admin is editing a normal customer account in the backend, there is a field named "Is Front-end Builder Account". If this field is set "Yes" then the account becomes a front-end builder, if "No" then the account remains intact.
How to create a Builder Account?
To check if your current account is a builder one, please login your account at front-end.
After logging in, if you see a "Active Builder" switch on top panel then your account is builder account.