Clicking the Explore button displays a full list of Avast One's features, which does look a little more complicated. But it's easier to understand what's on offer when you can see everything in one place, rather than browsing around a number of tabs. And if you don't understand something - what is 'File Shield', exactly? - clicking the option gets you a simple explanation (the File Shield allows Avast to scan every file you access to make sure it's safe.)