Kitchen Counters

I hope I can explain this, but how does one access the various add-on counters that don't show up under the 'Surfaces' heading? I have been trying to find the rattan end counters in my game since Island Living and haven't had much luck. I was playing around in buy mode today and by accident (because I had no idea this option was available) a variety of counters in different shapes showed up, briefly, in what looked like a drawing. I have no idea what I did to access this and can't figure out why it popped up. Let's just say I am feeling a bit stupid because I have been building a lot in Sims4 and this is the first time I have ever seen that display. I saw many different shapes that I would really like to use.