Amazon Fire 7
Here's the Amazon Fire Home screen. I installed an app called "APKPure" to install the Cobra Control Panel (as the Amazon custom OS does not come with the Google Play services like a normal Android tablet).
Here's the view of the Device list screen. (Click on the image to see it at the full resolution.)
Notice that this tablet has "Soft" buttons that appear on the screen. You lose screen space on the top and the bottom.
I believe some tables have physical buttons, if they do, they don't have these "soft" buttons on the screen.
The bottom buttons waste a lot of valuable screen space. (When you only have 1024 x 600 pixels, wasting some of those 600 for buttons and info hurts.)
In the Show controls widow, the buttons don't fit on the screen unless you scroll that section up.
Here's what it looks like with that section scrolled up. (Notice the Script name is off screen.)