Basic Mode - A revised, simplified user interface.
Advanced Mode - Advanced mode shows advanced option(s) on each screen. This allows advanced users to go deeper into the application. The left navigation is only displayed when this option is ON.
When you switch to Advanced mode, the advanced options on the page, if any, will flicker for few seconds.
An eye icon also appears as shown above where there are Advanced options on the page, and hovering on the icon will flicker those advanced options.