Congratualtions on your new Bounder. I was looking at some interior pictures of it on the Fleetwood web site, and it looks like a real beauty!
I don't have a Bounder, but I do have a 2017 coach, made by the same company, with the Firefly lighting controls. That system is new and unfortunately not well documented in the owner's manual. I noticed that you have eight lights on that slide - 4 above the cabinets and another 4 below. I imagine that only a couple of them come on when you open the door. That is intentional and meant to give you some light when entering the coach at night without having to immediately fumble for light switches. The lights should time-out on their own, and go out after a minute or two of opening the door.
As for controlling those lights, again I'm not familiar with your specific coach, so sorry I cannot tell you where to find a button that may control those lights. It is possible that those lights may serve a "double function" and be also controlled by a button somewhere in the coach, or even a conventional switch. You'll have to do some "experimenting" to see what buttons control what lights. Those lights in the slide will likely not be controlled by the same buttons that control the overhead lights in the ceiling.
Part of the "fun" of owning a brand new coach is figuring out idiosyncrasies like this.
Enjoy!
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PS... In your coach, what I was referring to above as the "Flirefly" system may be part of the IllumaPlex system that is in the new Bounder. In any event, the lighting system you have is new and was introduced either this year, or perhaps in 2016.