As most people on this site know, I don't have wifi, not at all, not in the least. Therefore, my kindle cannot contact the internet. I sideload all books.
For several years I used my PW2 unregistered, but wanted to: use Collections and update the firmware so that I could use custom fonts. So I went to a friend's, borrowed his wifi, and registered my kindle. I then updated the firmware.
Hey, I had access to Collections!
But, I also had a horrid home screen with 'recommended' books, even though the kindle was NOT in contact with the internet (no wifi). Through mobileread peeps, I learned that those three dots in the upper right of the home screen are your friends. They're responsible for so many things.
For example:
To switch off that horrid Home Screen, touch the dots and choose Settings. Then go to Device Options. Next go to Advanced Options; here you'll find Home Screen View, just change it to Off and that horrid screen is gone!
For Collections, provided your device is registered (even if it never looks at the internet again, like mine), touch the three dots and you'll see an option for Create New Collection. Create ahead!
To repeat, apart from registration, my kindle is in permanent airplane mode. Amazon can't spy on it, take anything away, nor add anything. I have to put books on it from the computer, which is connected via ethernet.
Don't worry, they're not out to get you.