ADVANCED WEB INTERFACE

The QOTO edit profile options include an "Apperance" webpage. At the top of the page, I see an "Advanced Web Interface" (AWI) option box.

I do not understand text which explains, "If you want to make use of your entire screen width, the advanced web interface allows you to configure many different columns to see as much information at the same time as you want: Home, notifications, federated timeline, any number of lists and hashtags."

I did click on the AWI box. But the consequences of my action remain unclear. -- see https://qoto.org/@freemo/103101593756636735

What next? Have I overlooked an online resource which will help me figure out what I need to know?